74 to 70 Dart parts swap

So the transfer of parts from the 74 to the 70 is taking me much longer than I had expected but we are moving forward. I want to replace the motor mounts and transmission mounts while it's on our terms. I've seen stock mounts from Autozone for less than $10 and other mounts up to $150. This is a completely stock 318, is there any reason to not go with the off the shelf less expensive mounts?

Also, I sold the interior out of the 74 and while loading the back seat into the new owners truck I noticed the build sheet. This is the first vehicle I've ever owned that had a build sheet and I'm parting it out...........
In the end I know the 70 will benefit from all the parts.

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