You can try e-gunparts.com
I have ni idea i am in the same boat I have had my 16 gauge for about five years now everything is numbers matching and works but i dont have the guts to shoot it I found mine in a old house that was abandoned
50-100 USD
50-100
*(Gun Appraiser)* they are worth about $250 to $400 thats for the 12 gauge single shot columbia. if there in poor rusty none shooting condition there worth about $50 to $80
were is the fuse for speed gauge
50-100 USD
50-100 USD
Try e-gunparts.com
It is important to have diagrams on hand of a cars parts. A free wiring diagram of this car can be found in the cars maintenance manual, or at an auto shop as a print off.
50-150 usd
Many different makes, models and designs. Start with Google.
Contact the manufacturer (or a main distribution agent) and quote the serial number