Does anyone own a b2920 with r3 tires(turf)and can you check to see what size tires front and rear you have that were on the tractor when new from kubota,and the manufacture of the tires,i think i got the wrong size the tractor was delivered with(rear 12.5x15 and 8.5 x12 I think they should be front 7.5x12 and 11.5x16 rear , thanks