Yep, most aftermarket tires come in 9" wide front. Not sure why they don't match what comes on the machines from the factory, but they don't. So right there you will add 1/2 inch to the overall width and probably rub the tie rod ends on the inside. 1/4" spacers can solve that issue, but now you will be at or over your max width for the truck bed. The other choice is an aftermarket wheel but the offset and backspace will be different so your total width will again be at or over 50"
Sorry, I don't have any good solutions for you.
Mine: 2018 Sportsman 850SP - 26" Bear Claw HTRs on OEM steel wheels(I really don't like the Aluminum ones)
Polaris Hand warmers, Mirrors.
Hers: 2007 Sportsman 500 EFI, Polaris Winch, 26" Bear Claw HTRs on Moose 427x Wheels. QSC Clutch Kit, Hand Warmers
2001 Magnum 325 MOSE 12" rear wheel conversion. 25" Sedona Coyote tires
2001 Magnum 325 Warn winch and Moose 60" plow
2017 Polaris Ranger 1000XP - Roof and front glass
SOLD 2004 Sportsman 600 Twin