It probably is a Harley set. The bolts holding them needed a 19mm metric socket - the problem was there was not enough room between the bolt head and other "stuff" to get the socket around the bolt. I had to get my pipe wrench on the riser itself to get the whole thing spinning, then jam my biggest flathead screwdriver between a bolt face and the yoke, then graunch it off. The OEM riser nut needed a 14mm socket, which fits easily. I didn't use a sleeve, just evened the position then torqued it up to PFT, seems to be working.
Like I said earlier but after a much longer test ride, the odd handling is still there, but manageable. I suspect Journeyman's right about the uneven wear and the next step will be to arrange a 2nd mortgage and change the tyres.
JHortz - let us know how you get on with yours?
