TRI ROD rubber on the axle

#3
I would guess that the Tri-Rod couplers are 108mm as well. I can measure one of mine, if need be, but that's a 4.25 inch bolt pattern. Seems like a common size for was had to have been an off-the-shelf part back in the day. If you look at how they designed/built these trikes back in the 70's, it seems most of them were mash-ups of mini-bike, snow-mobile and lawn mower parts. There's not really a lot of bespoke engineering going on with these things.
 
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