Dennis is correct.  The 13 in my head this morning was the head size of the bolt: they are M8x1 prolly around 3cm (1.5�) in length

> On 27-Jul-2018, at 09:46, Dennis Haynes <d23haynes57@HOTMAIL.COM> wrote:
> 
> M8 bolts will usually have 13mm heads. M10 will have 17mm heads (DIN).
> 
> Dennis
> 
> 
> 
> From: Vanagon Mailing List <vanagon@gerry.vanagon.com> on behalf of Roy Nicholl <RNicholl@NBNET.NB.CA>
> Sent: Friday, July 27, 2018 6:47 AM
> To: vanagon@GERRY.VANAGON.COM
> Subject: Re: Securing a bench seat
>  
> The bolts which secured the rail covers can be used to secure the bench to the rails.   I�d have to go look to be certain, but I think they are M10  or M13 � 
> 
> > On 27-Jul-2018, at 03:15, KI4TLF <ki4tlf@GMAIL.COM> wrote:
> > 
> > Mine had a set of bolts that just went through the rail and into the floor of the van.
> > Once the seat was slid into the van, another set of bolts went through the seat rail into the van rail.
> > I can't remember if they just went into the rail or through the rail into the van floor.
> > 
> > GregM
> > 
> > -----Original Message-----
> > From: Vanagon Mailing List [mailto:vanagon@gerry.vanagon.com <mailto:vanagon@gerry.vanagon.com>] On Behalf Of Jim. Felder
> > Sent: Thursday, July 26, 2018 9:52 AM
> > To: vanagon@GERRY.VANAGON.COM
> > Subject: Re: Securing a bench seat
> > 
> > Do you have the hardware? It is several (about 8?) sets of bolts and clamps
> > for the sliding rail. Some of the clamps, which are shaped for the
> > application, also have an extension that is located and tapped for the
> > screws that secure the cover plates I mentioned. At least the sets I have
> > seen have this, others made for other models could be different.
> > 
> > Jim
> > 
> > On Thu, Jul 26, 2018 at 9:42 AM Jeff Palmer <w.jeff.palmer@icloud.com>
> > wrote:
> > 
> >> Hi Jim.  My van already has the tracks, and it sounds like Eric's does
> >> too.
> >> 
> >> I was able to slide in the seat without a problem but wasn't sure how to
> >> secure it.  There seems to be bolts and clamps recessed in the track, and i
> >> wasn't sure if they were supposed to clamp the track down?
> >> 
> >> Thanks
> >> Jeff
> >> 
> >> On Jul 25, 2018, at 02:55 PM, "Jim. Felder" <jim.felder@GMAIL.COM> wrote:
> >> 
> >> I have a writeup with pictures on how to add a sliding seat to a camper.
> >> You need to cut the flooring where the pre-drilled and tap bolt holes are
> >> located, and make slots the correct width and length. You are first putting
> >> down a sheet metal tray, and on top of that the tracks that receive the
> >> sliding seat. Then, there is a set of hold-down hardware that secures the
> >> seat and keeps it from sliding. On top of that are metal covers and very
> >> wide headed screws that bolt the covers down to the special brackets for a
> >> smooth flow when the seat it out. I have a set of this stuff that includes
> >> everything but the sheet metal trays and the sheet metal covers. it
> >> includes the tracks and sliders, which can by the way be installed on top
> >> of the floor, so no cutting and no metal trays to fool with, but when the
> >> seat is out you have these two metal brackets all the way across the floor.
> >> 
> >> Jim
> >> 
> >> On Wed, Jul 25, 2018 at 3:44 PM Eric Caron <eric.caron@icloud.com> wrote:
> >> 
> >> Hi Jeff,
> >> 
> >> 
> >> I�ll be looking forward to the answer.
> >> 
> >> 
> >> I have two bench seats one brown and one grey. The older brown one
> >> 
> >> matches my van the newer grey one seems a bit lighter and has backs that
> >> 
> >> flip down.
> >> 
> >> 
> >> Neither one seemed to fit perfectly as the slider didn�t want to close.
> >> 
> >> 
> >> I suspect both mine were for passenger vans. I was recommended to
> >> 
> >> remove the arm rest on one side and that did make the seat fit beter. I
> >> 
> >> recently removed both arm rests from the Grey one and that gave me some
> >> 
> >> wiggle room. I then used the same bolts that hold down the metal track
> >> 
> >> covers to secure the seat from sliding left to right. I only put in about
> >> 
> >> two bolts.
> >> 
> >> 
> >> I suspect there is actual additional hardware for the seat to be secured
> >> 
> >> but I�ve never had my hands on it.
> >> 
> >> 
> >> I�m looking forward to responses.
> >> 
> >> 
> >> Best,
> >> 
> >> 
> >> Eric Caron
> >> 
> >> 
> >> 85 GL Auto
> >> 
> >> 
> >> 
> >> On Jul 25, 2018, at 12:18, Jeff Palmer <w.jeff.palmer@ICLOUD.COM> wrote:
> >> 
> >> 
> >> I have a double bench seat that I�ve installed on the tracks in my 85
> >> 
> >> Westfalia. How should I secure the bench seat from sliding (not that it
> >> 
> >> ever would). There are brackets held in place with bolts. Do the brackets
> >> 
> >> secure the frame somehow?
> >> 
> >> 
> >> Thanks
> >> 
> >> Jeff
> >> 
> >> 
> >> Sent from my iPhone
> >> 
> >> 
> >>