Kab, that's what is looking like. The 55 is too tall, it will hit the sxing arm arch. Bolts need the 50. However I thought the lightnings had the same swing arm? Although, I really don't care I just want the wide look.
My dad used to take me to all the custom car shows so I am all about wild looks. I too am concerned with function but if I had the money to do it right, I'd love to have a fat-assed bike with a huge wheel out back. I think it looks absolutely super tough. I envy all who have done this mod. Keep up the good work [up]