Well, here's an update:
Over the last few days, I have been in contact with Ken at lowpricerc.com. He has since updated a few of the item descriptions that I had questions about, giving the dimentions of the mounts.
I have since made some suggestions to him about improving the information on the products, and he said he is going to look into it.
I must say, I now feel much better about ordering from them, knowing that someone is really there, and will answer questions that I have. I have actually received replies from 2 different people there about the same items.

I think i'll give them a shot and place an order for some parts. I'll post another update to let you all know how it goes.