They are not a direct fit, but can be modified to fit; provided you have the 9" rear drums (appx TS56377 and later). Center hole has to be enlarged, and IIRC the stud holes also have to be larger to fit a TR3. Some of the lip at the outer edge has to be removed as well; how much may depend on exactly which drums you get, and which TR3 brakes you have. The drums I got had two lips, and for the backing plates that were on TS39781LO (not originals), I had to remove most of both lips. Never did finish that project, the drums are still in the garage somewhere. So are the brakes for that matter, but the car is long gone.