Brake/wheel question here. I noticed a diff in the rear calipers between my 128 and my 129 parts donor. The brake pads seem to be the same, but the calipers appear diff. Was there a diff on calipers between gear drive and hydro drive tractors? Also was there a tire size standard for the wideframes, i.e. an 86 model had 6-12s? Or were tire/wheel sizes an option throughout the wideframe models?