Body cushion (biscuit)

I am restoring A 67 GTO. In preparing to remove the body from the frame, i noticed that the rubber bushings in front of the rear wheel, and over top of the rear wheel has no bolt, just a biscuit. Now in researching this i found that this was done starting in 1968, so my 67 must have been built late in the 67 model year. So i have already purchased body mount kit from OPGI. I just need four biscuits for a 68 GTO. Trouble is i can't find just the biscuits, i don't want to buy another brushing kit just to get these four no hole biscuits. Any ideas on who has them, or a good workaround?
Thanks
LET