what model dio you have , when you said 89 250 I looked it up , I have no clue where you are but here in the USA in 89 there was only one 250 it was the R , in 88 there was a X and a R , in 89 the boot between the carb and air filter was $53 from Partzilla and is no longer available , the part number is 17253-HB9-670 , and it only fits 3 years of the 250 R , when I put that number on e-bay all I find is one air box with the rubber boot on it for $65 or best offer