I got J&P Cycle's part number 2300012. they're for 41mm forks, but to be honest, they fit more loose than I had expected. The ones that my buddy got for his street bob from J&P were tight on the top and bottom and we had to stretch the boot over the fork dust cap on the bottom, which made for a nice, snug fit.
The ones I got came with 2 zip-ties per boot and mine have not moved and look good. The loose fit was not an issue at all. The rubber can stretch a bit if needed.