Thanks for the input. The sales fellow at Walt's didn't give a definitive answer to my question as to whether it would fit or not and didn't offer to check into it more closely. So I went to the Steiner Tractor Parts site out of Michigan and ordered from them. A bit more money, but I think if there is a problem with fit that I can get most or all of my money back. Here is what they have:
WHS013 28" x 12" Rear Tractor Rim (Steiner Tractor Parts)
Case - Replaces: G45710
Ford - Fits: [2000 3 Cylinder, 2N, 4000 3 cylinder, 4000 4 Cylinder, 8N, 9N, Jubilee, NAA, NAB, 71, 501, 541, 600, 601, 610, 611, 620, 621, 630, 631, 640, 641, 650, 651, 661, 681, 700, 701, 741, 771, 2030, 2031, 2110, 2111, 2120, 2130, 2131, 2300, 2310, 2600, 2610, 2810, 2910, 3000, 3055, 3100, 3120, 3300, 3310, 3600, 3610, 3910, 4110, 4600 (Some)], 2000 4 cylinder, [Industrial: 230A, 530A, 231, 233, 335, 531, 3400, 3500, 4400 (Some)], [Industrial : 234, 333, 334 (Some)], Industrial: 4500 (Some using 12 x 28 6 loop rim); Replaces: D9NN1050EA
International - Fits: [B-250, B-275, B-414, Hydro 84, 330, 354, 364, 384, 385, 424, 434, 444, 454, 464, 484, 574, 584, 606, 684, 784, 884, 2400, 2500 (Some)], [International Utility: 300, 340, 350, 404, 460, 504 (Some)]; Replaces: 363988R91
John Deere - Replaces: AL15369, T21743
Massey Ferguson - Fits: MF Industrial: 20, 30, MF Overseas (UK built): 35, MF Tractor: 35, 35, Ferguson Tractor: 40, MF Tractor: 50, MF Ag Tractor: 50, MF Tractor: 65, 135, 150, MF Industrial: 202, 204, MF Tractor: 230, 235, 240, 245, MF Industrial: 302, 304, 2135, MF Forklift: 2200, MF Industrial: 3165, MF/Overseas: FE35, Ferguson Tractor: TE20 (Some), TEA20, TO20, TO30, TO35; Replaces: 192290M1
Massey Harris - Fits: 50
Minneapolis Moline - Fits: [4 Star, 4 Star Super, Big Mo 400, JetStar, JetStar 3, Jetstar 3 Super, 445 (Using 12 x 28 6 loop rim)]; Replaces: 10A7491
Oliver - Fits: Super 55, 550, 1250
White - Fits: White: 2-44; Replaces: 672478A
Runs $214 delivered. Could have saved myself a lot of time and money if I had drained that blasted slat water when I parked it or at least seen to it that the valve stems were on the top. "C'est la vie."