Chris
I have done many of these interiors and I yet to find a source for seat covers and interior panels. The Cadillac has three times the pieces of any other GM car. I have done dozens of them and they are very satisfying to complete. They take a lot of time, so do not short yourself on the labor side of your estimate.

Yes, I agree with you Fred. Intense labor. Very detailed with many pieces. Try contacting Jenkins Interiors in North Carolina. I recently installed a set they fabricated for one of my customers. Decent fit and properly made.

done many caddys before and always do it the proper way but this guy doesn't want to spend that kind of money so I just said look for kits if your fancy a go yourself , so I just thought id ask here on his behalf

You might want to try Auto Custom Leathers. I believe they have the patterns on their cad machine.

Jerry from Auto Custom Leathers has done two of the old Caddys for us.
They always do a great job... sometimes it takes longer then they promise
But all good