Unlikely
When viewing a handgun from the rear, the backstrap is the metal part in between the two grips.
They're scary looking.
Yes
Typically ATV grips are the same size on both left and right sides, whereas motocross grips have a larger core on the one side to accomodate a twist throttle.
most any large gun store will have them.
Best left to a trained gunmsith
Grips, magazines, sights.
Do an internet search for Colt SAA grips and be prepared for dozens if not hundreds of hits.
frame, barrel, sights, grips
Check the markings on the slide, frame and grips.
Bersa has a line of pistols called the Thunder. The .380 acp version is modeled closely on the Walther PPK. There are a wide variety of options with the Bersa Thunder--mostly color schemes, grips and other accouterments. One major difference in this line is a pistol designed especially for carrying in a concealed fashion. They basically took the regular Thunder pistol, and rounded off many of the protrusions so the pistol will be less likely to snag on anything when it is pulled out in an emergency. It likely has a magazine capacity of 7 rounds.