I need a front bumper black end cap any ideas

by the way that is for 1988 40' if it makes any diff

I have 2 missing end caps, & tried to locate some a couple years ago without success. I've thought about making a mold from an existing one, & making some out of casting resin with glass fiber reinforcement. It's low on the priority list, however, & I'm not sure I'll complete the other pending items before I abandon the idea of making more improvements.

thanks