Yes don't worry we understand you fully, you'll be up to speed with the others in no time.

I think Kev has already given you the best advice, i.e. to buy a second hand one on ebay because only the original will work and you couldn't fit one from a different bike, infact the first one he quoted you is your best bet!

http://www.ebay.co.uk/itm/USED-YAMAHA-GENUINE-PART-THROTTLE-SENSOR-ASSY-TDM900-XT660-FJR1300-/350689650134?pt=UK_Motorcycle_Parts&hash=item51a6b b65d6#ht_391wt_1156