Best left to a trained gunmsith
They have been made.
Unlikely
Yes
They're scary looking.
most any large gun store will have them.
Grips, magazines, sights.
see the link below
You will need the owner's manual to walk you through the disassembly of the pistol. Springs are removed as part of the process. Re-assemble the pistol with the new springs. If you are not comfortable with detail stripping and re-assembling a pistol, have your gunsmith do it for you.
Check the markings on the slide, frame and grips.
frame, barrel, sights, grips
Do an internet search for Colt SAA grips and be prepared for dozens if not hundreds of hits.
check: http://stevespages.com/page7b.htm