Some years ago I bought a 1991 in SS. I call it my truck gun as it was in the tool box of a truck covered in dirty oil and other nasty stuff. I asked my friend why it was there and he said you couldn't hit the side of a barn from inside of the barn with it. The trigger was not good. He was going to give it to me but I have had bad luck in the past with people giving me guns so I gave him $300 for it although I was not sure what I had. It was in a flap holster which did protect it and which I did throw away.
Anyway I detail stripped it, cleaned it and put all new springs in it. It had an unnamed mag in it which I got rid of. Putting it back together it did have a horrible trigger pull. I decided to shotgun it with pieces from my parts box. I fit a new sear from Wilson Combat, a new disconnector from Briley, and new Series 80 parts from Cylinder & Slide. Now the Cylinder and slide parts are nicely done but plated in Titanium nitride? Anyway they are Gold in color. Next I fit a long solid trigger from Nighthawk Custom and it took some time to fit it. I could never get the non metallic MSH to look real silver again so I ordered a SS one from EMC. Almost all the parts were ordered through Brownells by the way. I also put on some wood stocks ordered from Colt back when Colt sold parts on their website.
Not sure but if you get a long trigger that came out of a Colt it might just drop in and work. I was happy when my SS MSH from EMC went in with no fitting and it fits nicely. And the rubber grips that were on it initially have finally outgassed and are no longer stinky after a few years on the top shelf of my outside workshop.