There's no rhyme or reason if they've been used over the years...note Smith's No. 198 below. He obviously gave up on them damn pot metal things after awhile.
Yes...stock is black, but any seepage will screw it up. I finally gave up and went with Kirkham's arruminum ones, which could be painted or coated. They look identical and there won't be any problem with the seams splitting. I also gave up on the POS Girling caps, and went with Wildwood black plastic caps, which look like the Girlings but don't leak, get bent, etc. I keep the Girling caps for any shows, etc.
