36 spare tire cover lock retainer clip

[johndee138]

I need a 36 spare tire cover lock retainer clip. The clip holds the lock cylinder into the piece that keeps the faceplate from being removed for access to the 3 bolts that hold the tire on. I've tried a snap ring but it interferes with the spring action that pushes that locking plate off the big dish.
I seem to remember a spiral split ring thingy that there were some remnants of when I acquired the lock setup years ago.
Anyone know of this bit of unobtainium?