I wasn't aware of Corbin's retrofit kit. It's not specified on their website. What is it exactly - replacement bolts, I hope, instead of spacers. Do you know if there's a Corbin part # for it?logoguy said:Not trying to take any business away from Bahnbuirner but it's really easy to modify those lugs if you live within 100 miles of a good hardware store. And Corbin has a retro kit they offer.