WTF.... motor mount

doing 318 to 360 swap, ordered lh motor mount, seen it on stores computer screen, 5.9 lh motor mount for 1974 dodge dart, also fits 5.2. so i thought i'd take a chance, got it today and it's exactly the same as 318, needs about a 3/4'' spacer. is it possible to find a motor mount that goes on without spacer,or should i just return it and use my 318 mounts with spacer?