Vintage BMW Motorcycle Owners

Can anyone enlighten me with mounting details for my standard R69S tank?

At the front it attaches with a bolt but how is the tank attached at the rear?
There are no lugs at the tank rear and I can't imagine it just rests on the frame tube metal to metal.
On mine there where rubber pieces between the tank and the frame but they don't look original and I don't see them in the parts list.

Thanks in advance,
Peter

Here's a picture of the aft frame mount for the R69S tank. Two long bolts go up from the bottom through the stack up of rubber washers and thread into the tank.

Thanks Kurt!
It's clear now I'm missing the horizontal bar.