Hi,
Have you removed the bracket from the hub ? usually just two bolts, though a good dose of penny fluid overnight will help.
Once off then you could place it so the pins are vertical , then again use some penny fluid to trickle down and leave overnight or soak in a bath of some fluid etc.
Using heat might also help, but be aware one of the pins may have a rubber end.
Cannot see it being a generic part or available from any aftermarket supplier, Mr.T only if they still have them, or a scrappers.
As long as the bore of the pin holes cleans up without any bad wear or scratches it should be ok..
For new pins try https://brakeparts.co.uk/