This item seems unnecessarily complicated, don't know why. JTF1370RB is the JT part number. I find it only in Europe. That site says it ships to the US...until I try to buy it. THEN a window tells me they do NOT ship to the US. The JT website lists it, but it cannot be purchased from there. IF the 'RB' (rubber isolated) part is chosen on the JT website, the next window shows the NON-RB version. In the middle of the AT 'problem' thread I see a mention of the rubber sprocket and problems resulting having NOT used it. I have contacted US based parts suppliers and gotten NO replies. The 'RB' type, what the OEM sprocket is, is mysteriously missing on this side of the pond? A link to somewhere that has one other than OEM would be appreciated. 16T/stock gearing.