No worries, was going to direct you to a site with GM Fox parts if that was what you needed.. Here is one that might have some spares, I picked up some Saladin spares from them. Don't know about Fox though. https://www.cvrtparts.com
I looked for over 10 years and missed out twice in that time frame, Clive Hughes has a few bits, I had a few of the actual bases made/recast years back, but you will probably have to have one made..
Cheers, the Liberty MK III to MK V are pretty similar, and I think the final version in the Crusader was the MK IV differences were governor speed and a few other things, will check it out..