you just use one or two of the existing big panhead flathead bolts  from
the covers.  you already got everything you  need.     most people dont even
bolt the seats to the  tracks, the tracks hold the seats in place.   once you
install the  seat, just replace the covers to the side of the seat and the
seat cant go  anywhere anyway..

In a message dated 11/1/2014 10:11:10 A.M. Eastern Daylight Time,
ecaron1@COMCAST.NET writes:

I  am now pleased to have a optional middle bench seat that even matches my
van  interior.  But, it did not come with the hardware to secure it once it
is  on the rails. The seat I believe is from a 86 and the seat backs flip
forward.  My Van is a 85 GL with the optional rails built in.    It has been
about 15 years sense I used one like it.  Can someone remind  me what is
used to secure it to the floor?  And, a suggestion for a hard  ware store
alternative?

It would be great to use the existing screws  from the covers but I don't
think that it works that way. tips appreciated.

Eric Caron
85 GL Auto Westfalia