I'm not sure of the exact part numbers and I don't have access to the car at the moment (I'm at work!). Here's the link to the thread I started with the same question when my restoration began.
http://forums.pelicanparts.com/showthread.php?threadid=237453&highlight=jhladousa
If you have a 1974, you should have no problem with 16x7 wheels with the right tire sizes. I ended up buying a set from a fellow pelican (Jason Cullen) and they were refinished by Al Reed. Jason was awesome to work with and had great pricing. He always has wheels and can get them in any finish you want - he's also a great resource for questions if you have any!