You don’t have to drill holes, you only need to drill holes in the wheel well lip, it is not necessary to drill holes in the side of the fender. The Toyota Tundra’s and maybe the Tacoma flares do not have holes in the side of the fenders, my dad tore one of his flares off his Tundra and it was attached with double sided trim and using the wheel well lip from the factory, that’s where I got the idea to mount the factory Ford Ranger flares.
My 04 didn’t come with flares, I ordered 06 Ranger flares and drilled holes only in the wheel well lip, attached them with the plastic Ford tabs, then used Fender flare trim from Toyota (Toyota Tundra), it attaches to the edge of the flare and has double sided tape which sticks/protects the paint of the fender from getting scuffed up by the flare.
Notice the Toyota Trim
2005 F150 Ext. Cab FX4
1993 XLT Reg. Cab LWB 4x4 4.0 5spd
6" Superlift Suspension Lift
Front/Rear Multi-Mount w/smittybilt 10,000lb Winch
315/75/16 Pro Comp Xterrains
16x10 Pro Comp 8179 Wheels
Warn Grill Guard