Not to nit pick, but these are not 1970 bucket seats.
1970 bucket seats were a 1 year only seat, which had a different seat back, and pot metal button cover.
Having said that, the car is coming out great, glad I found your thread. :)
Those seats "do" have the pot metal cover button cover. those seat backs are reproductions, but I do have the originals. show me a correct 70 seat if those are not!!