Rear brakes

Ok I have 69 cuda 10" rear drums 8 3/4 rear
I Cannot find a set of drums to work infact all parts stores are showing listings for 10x1 3/4 shoes and only 9" drums ???? What the heck is going on , can anyone help with a part # or anything????? Old drums measure 10" w/ 3" height
I did have a guy find drums from2000-06 Mazda mpv 10" x3" tall 5 x 4.5 bp and they are so close but just to tight. My axle have been drilled to lbp and I don't mind drilling drums if I could find some!!!! Anything would help at this point thanks