C20 to C10, How To

[tomatocity]

I can't figure out how to search for a How To or FAQ so I am forced to ask a question that many of you have heard many times before.

I am looking at a couple of C20's. If I were to buy one I would eventually like to convert it to a C10 for better looking wheels and ride quality. What parts need to be changed to make a C10? Do C20's have rear coil or leaf springs? Thanks in advance.

To answer a future question(s). Some of the C20's for sale are better equipped, in better condition, and better priced than the C10's.