To answer your question is very difficult
You are looking for parts that are unique, that are made by Colt and for very small batch of pistols that our country adopted almost 100years ago. And not really used ever since. Your best bet would be to post WTB add in the EE and probably buy a parts gun. Otherwise you have to go and browse gun shows around the country to find unicorns.
Look at it this way even common as dirt Tokarev parts that are proper for particular specimen are hard to find. Canadian contract 1911 oh boy it may be years to locate stuff.
Goodluck.