Try e-gunparts.com
Yes, 380 or 9mm from a model 58 or 59 is the same pin...
Have it checkd by a good gunsmith before firing.
No such weapon ever made by S&W
Best thing to do is to ask a gunsmith for help.
$100 or less. Parts are unavailable and very few of them actually work.
25-125 USD or so
bryco has now turned into Jimenez firearms they are out of California and distribute essentially the same gun try contacting them.
Try e-gunparts.com
gun show, gun shop, pawn shop, want ad, garage sale, estate sale
What specifications are you looking for
You can check for parts at gunpartscorp.com, or most gunsmiths.