Measure the back of both manifolds, it's probaly one inch differance. If you need the long one 8-7/8 about all the part places have them Mac's ect. Walt
Some of the stock fuel pump push rods were three pieces, a center tube and two different length ends, I made a longer one by taking the shorter end out and stealing the long end from another rod... Put it together and cut to size. I do not remember what the possible length of this combo is...
Karl