Thanks Tim, I have bought a few things from them, I wonder about fit and so forth.
Maybe someone here has bought a set from Classic Parts, and maybe they will comment on "fit & finish".
I have never had a problem with anything bought from Classic Parts (3 restorations).
As you ponder over other vendors' quality (fit & finish), consider this:
Years ago, I bought an 8-piece ($$$) 1954 Suburban set from Jim Carter before I knew about 1954 Suburban seats/colors (I was told/assured that the color was correct for 1954). The set he sold/sells for 1954/55st is not correct (it is correct for 1953).
I also found out later that there are two different sizes of Suburban cushions for 47-55 Advance-Design Suburbans. The one set he sells was not correct for my year/size seat cushions.
A few years ago, JC assisted by allowing me to contact his local upholsterer to make a set with the correct colors/sizes (with me paying JC for the new, correct size/color set).