MWO 9-2320-280-20-7 Modification of 1-1/4 Ton Vehicles, Carriers: M998, M998A1, M1038, M1038A1, M966, M966A1, M1026, and M1026A1 CROSS MEMEBER REINFORCEMENT (allows M1101/M1102 series trailers to be towed to humvees WITHOUT the Airdrop bumper)
The other one I'll have to recheck the number...