71 Demon bucket seat assembly question!

Bought a set of buckets to replace bench seat in 71 Demon, came with all the screws and hardware loose in a box but with new covers installed. My question, is there supposed to be a bumper or stop of some sort opposite the latch (inboard side) and if so can anyone post a picture of it, and know where to get some? Seems to be all that I am missing.