studio flash

I have a number of Multiblitz Profilux studio flash heads, purchased many years ago. They were all supplied with the item in the photo, a flat plate with two holes, one small and one large which were supplied fitted to the knob that attaches the clamp to the tripod post. Pictures below. Does...

I have 3 Profilux 400 and 2 Profilux 200 heads, these all use the same flash tube COMROW-4, which are still available, if a bit pricey these days. Multiblitz folded a few years ago, my units are all pristine and only get hobby use so I cannot justify the cost of replacing them with current...