11.00 20's on a m715?

i have a chance to get a new set of michelins XLS 11.00/20 for cheap and ive heard that the old international harverster Metro has the same wheel bolt pattern as the m715 and ran 20" rims...... do ya think there is enough clearance in the tubs to run these meats.
I found the specs on the tires..... 1100x20 = 40.99" tall = 128.8" C.
talk here says a 38" will just fit ?? waddya all think?
thanx in advance

larry