[Triple6Goat]

I have a 62 c10 that I swapped a 72 front crossmember into. I bought a set of 67-72 motor mount perches from CPP and im aware that the 62 frames are shorter so I will need to make a 1 inch spacer, but my question is which hole on the crossmember does the bottom of the perch go into? It makes sense to go in the front most hole but from the pictures I see on the perches wrote up on persh.com they're all in the rear. I just want to be clear, any pictures will help. Thanks
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