55 chevy seats... cadillac?

I have a 55 chevy 4 door that im looking at seats for. of course the seats back then were not all that great so I have been looking at cadillac seats.
does anyone know how these can be put in? I realize that you just drill new holes for the mounting points in the front seats. im wondering if someone has actually done it and can give me some advice.
Im also looking at putting in a set of rear seats in. how hard is it to put in a set of rear cadillac seats in an old chevy?
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