Years ago transgo offered the larger diameter ones in their reprogramming kits .... but my guess is they were cast.
I thought I might have seen another brand at one time (Tci?) .... never saw one that was billet.
I may have to buy an FMX kit from Transgo to get the servo parts I need for this old cruise o. I was just hoping someone had a servo to make these old slugs shift. Modifying the old servo and cover is a lot more work than I really care to do and I really don't even know if the fmx and cruise o servo's are the same size.
I've not seen the kits w-servos in many years as mentioned. Only found the basic level Shift kit from TransGo.
I built 3 FMX - Cast Iron cruise-O units last year. Had one with the common split case in center section. I could not find my tooling for drilling and bolting that crack together. Tore another core down for a case