Try e-gunparts.com
25-125 USD or so
Yes, 380 or 9mm from a model 58 or 59 is the same pin...
bryco has now turned into Jimenez firearms they are out of California and distribute essentially the same gun try contacting them.
Have it checkd by a good gunsmith before firing.
Try e-gunparts.com
You can check for parts at gunpartscorp.com, or most gunsmiths.
Try e-gunparts.com
Best thing to do is to ask a gunsmith for help.
50-100 USD
No such weapon ever made by S&W
If you don't have an owner's manual, find a gunsmith and ask for help
If you don't have an owner's manual, find a gunsmith and ask for help