I have a question concerning spider brackets. The one on the right is the original one, and the one on the left came with my ACDelco MFI spider. From what I've been reading, I need to change the spider bracket so the plenum cover will fit properly over top of it. The old spider bracket on the right however mounts on the lower intake completely different. It has an indexing pin which goes into an un-threaded hole , and the screw is captured. On the new one, the hole is too big, and the screw to hold it down just passes right through it. If I used the smaller end of the keyway slot, then the spider doesn't line up with the plenum cover. Can I just use the old one?