carb questions

[black and blue 86 250r]

I was wondering if anyone had some suggestions about making a stock air box work with a 38mm carb..I recently bought a 38mm carb from a buddy but he did not mention what I had to do, as far a carb boot to make the stock air box work. If anyone has any ideas let me know..thanks this is the only thing holding me back from riding..

[nitrousbaby]

it should fit it will be a little snug but you can get it on might have to heat the boot up a LITTLE BIT just to get it to stretch. my bro uses the stock boot on a 40.5