In the event it helps in any way, here are the List prices from 2009 for ROPS 4x4HST.
Front 7.2 - 16 R1 AG Rear 12.4 - 24 R1 AG $21,437.00
Front 10 - 16.5 R4 IND. Rear 420/70 - 24 R4 IND $22,063.00
Front 29 x 12.50 - 15 TURF Rear 44 x 18 - 20 TURF $22,093.00
Front 27 x 8.50 - 15 TURF Rear 355/80 - D20 TURF $21,543.00
Front 27 / 10.50LL x 15 Galaxy Turf Rear 41 / 18LL x 16.1 Galaxy Turf $22,107.00