Send a letter to Colt Manufacturing and they can provide much of the requested information on your pistol; make sure you include the barrel markings and serial number.
The best source of parts is
Welcome to Numrich Gun Parts Corp but you may have to keep checking as their inventory is akin to a revolving door.
Your pistol is probably chambered for the .45 Colt (commonly called the .45LC). Value can be in the high hundreds; I've viewed some as high as $2000.
Good luck.
To post pictures I simply copy them and then insert them into the post. It's easier then uploading.
BTW; welcome to G&G.