2 inch from BORA, however they are made to order and takes 2 weeks lead time. I have had them for two years now and they are great but pricey. But with that being said I don't worry about my rear wheels falling off while I am driving down the road with my family in the truck doing 75 mph.
1.75" is perfect for the studs but almost impossible to find. 2" is a safe bet if you don't want any chance of trimming your studs and close enough to the front track width. I'm running 1.5" and have had zero issues so really can't go wrong lol
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