Top of the morning to ya. I have a bottom bracket mounted one if that's any good. Think it's part of a downhill chain guide. Very similar to the one dr s used on his cotic i think
I've got a Gusset Batchelor, its missing a couple of bits to fit it. Looks very similar to the DMR one above. If you have lots of bits and bobs you'll probably be able to make it fit.
If you want it you can have for free