there was one on e-bay recently
I have a homemade D2 one here I remember my Grandfather very carefully copying it from a dealers gauge. All done with hand tools hacksaw and files. Would be easy with modern CNC cutting gear. There are a lot of measurements on one of those things for chains rollers sprockets and idlers.
Good find.
I have one or two on a shelf. I seem to remember them only have the numbers on stickers? They are CAT logo'ed. I'll have to look today?????
great items to have reproduced--maybe even in plastic and then made available to forum members