After hours of research I am coming up short so I pose this to y'all for some help. My '68 Coupe has OE PB but after taking the booster and MC out to work the engine bay, I realize that some is not right. There is a spacer between the booster and MC which has a rubber gasket on the PB side and nothing on the MC side of the spacer. The MC does appear to seat that well and looks as if there is perhaps a gasket missing but I cannot seem to locate a replacement. Also, on the push rod side, the rubber gasket was so ragged that I removed it thinking I could just buy a new one but none of the parts shops seem to carry it. Pics attached. Appreciate some help on this one guys.