I am in the process of getting a commercial chassis 1959 Cadillac on the road again and had a question about the wheel cylinders. It appears the the left and right front wheel cylinders are the same as are the left and right rear are also the same on the series 60 and 75 but is the same true for the commercial chassis? I am finding a lot of listing on websites like caddydaddy and cadillac parts ltd, that don't always specify if the wheel cylinders are for a commercial chassis or not. It would be simple to call the companies and ask but calling companies and waiting in call ques takes a lot of time. Does anyone have part numbers for front/ rear and left/ right for commercial chassis wheel cylinders or better yet a website that would have these parts? Would knowing the bore size help in identifying a commercial chassis wheel cylinder and is the bore the same for both sides on front and back? Thank you.