b2400 front rims

[firebird93]

i purchased an older lowhours b2400 series tractor last fall and want to go to turf tires. i have had no problem finding them for the rear. but i am having an issue finding them for the front. my tractor has 10" rims on the front but requires 12" for the correct turf tires 23-8.50x12. the problem is that the part number (6c040-50240) for the front rims is for a 12x5 rim. all the newer tractors from the 2410 up calls for a 12x7 rim (6c040-50640). my question is will the newer rims fit my 2400? local dealer says he cant get the 12x5s anymore and wasn't sure the newer ones would fit. anybody have an answer??