Bob,
I've been doing an exhausting research project on my 33 90 7PS. Had two samples in the car of fabrics, one a olive drab/brownish broadcloth with an H design. The other a olive/brown mohair.
Car exterior is black.
Recently had the opportunity to meet another fella with a 33 90 7PS that was totally original. He had the same H material but more on the camel side color. He related to me the PO had searched everywhere for the original H broadcloth.
I'm probably going to do the mohair sample that was in the car- It's pretty much dead on to the LeBaron -Bonney 30-1 olive/brown mohair.
This maybe what you are looking for- Go to their web page and click on fabrics.
www.LeBaronBonney.com You can request samples too 1-800-221-5408.
I don't know if it's correct or not but they can send a sample page for interior patterns for 1930-1935 Buick. However the piece left in my car didn't match these ???
I'm sure there are others, this is just what I've run across so far-
Sandy
OCM