I have a couple of those bolts here.
They're grooveless,
and they 'seem special' but near as I can tell it's a normal 13mm hex head
bolt with 8 X 1.25 metric thread, like you could buy at any hardware store
pretty much, or car parts store.
threaded portion is 1/2 inch long.
Scott
www.turbovans.com
----- Original Message -----
From: "Frank Condelli" <RAlanen@AOL.COM>
To: <vanagon@GERRY.VANAGON.COM>
Sent: Thursday, October 02, 2008 3:34 AM
Subject: Re: Radiator bleeder BOLT question

> In a message dated 01/10/2008 11:09:54 A.M. Central Standard Time,
> LISTSERV@GERRY.VANAGON.COM writes:
>
>        Mike, sorry to report that  many of them do not have the groove.
>
>
>
>>>>>>>>>The "Original" bolt does have a groove  on one side that goes
>>>>>>>>>nearly
> to
> the bolt  head.<<<<<<<<<<
>
>
>
>
> Cheers,
>
> Frank  Condelli
> Almonte, Ontario, Canada
> '87 Westy & Lionel Trains (_Collection for sale_
> (http://members.aol.com/Fkc43/trainsal.htm) )
> _Frank Condelli &  Associates_
> (http://members.aol.com/Fkc43/busindex.html)
> - Vanagon/Vanagon Westfalia Service in the Ottawa Valley
> _Vanagon Stainless Steel Exhaust  Systems_
> (http://members.aol.com/Fkc43/exhaust.htm)
> _BusFusion_ (http://members.aol.com/BusFusion/bfhome.htm)  a VW Camper
> camping event, Almonte, ON, June 12 ~ 15,  2008