Here's one on steal-bay, I mean eBay.
JOHN DEERE 31 TILLER MULE DRIVE 110 112 200 208 210 212 214 216 AM34259 | eBay
As for an image or two or three,
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The is a a bad steal, way over priced, but . . .
JOHN DEERE PART NUMBER: AM34259. USED JOHN DEERE MULE DRIVE FOR A MODEL 31 TILLER. FITS MODELS: 31 TILLER.
www.ebay.com
another,
john deere 100/200 series tiller mule drive. In working order i have 3 available.
www.ebay.com
WOW, if it's just two pulley's spaced apart with a bracket, fabbing one up and offering it for $225, people would have a nice small income.
Make about 10 or 12 per year. And if other models are slightly different fab those too. I can see a market for these things for a retired person to make.