Front Hub lockouts, what to do?

[O'skool 72GMC]

On my 72 GMC 3/4 4x4, I was hearing a rattle noise coming from the fron axle lockouts. I pulled it apart to find that the plastic had cracked and the pin was moving around in the hub.
Do I just replace the one plastic part? if I do where can i find one?

or do I upgrade to the mile marker or warn hubs?

Its a daily driver and I do drive it through baja, I want to make it as bullet proof as i can.

Thanks,
O