I put a 26 tooth Baker on my 2007 today and indeed the belt was anout 3/4 of an inch too long. I cannot find a slightly shorter belt so I went with adjustable idler.
I knew this might happen so I just ordered adjustable the idler from Trojan Racing in England and a new 135 tooth belt from ASB. It was an expensive mod and in all set me back $520($170. US for the idler, $150. for the pulley and $200 for the belt with shipping and tax).
My Super TT was a torque monster before with a race ECM and Jardine pipe, it should really rip now with the lower gear and the lighter pulley. I look forward to reporting what my experiences are with the lower gear.