Replacement covers for Fastgun locks?

Though it would be difficult, but 'could' happen, maybe, but I've always looked at the locks more to ensure the fastguns don't become disengaged, and or one step to ensure I have closed. Suppose a lynch pin would work to that end. Our step also uses the pin locks.

All our caps the lanyard have broke, finally misplaced? one of the caps. I hadn't pursued because, one, I couldn't find source but also assumed new one would also break.

I put lanyards on the locks themselves, never thought about making for the caps.