20's on b2200 mazda

i just bought some 20x8.5 golden wheels and when i was ordering them i asked the guy if they would tuck and not hit my fenders and he told me yeah. when they put them on it it my fenders on all for corner so im wondering if there a way to cut the inside to make fit or wat offset so i need if i trade them so they could tuck good with out hitting fenderswit out 4x4 fenders

ITS TOO TIGHT ON 2WD FENDERS AND BOX WITH A 8.5 WIDE RIM..I USED THE VOODDO RIMS ON 225 30 TIRE AND I WASNT HAPPY WITH IT.....U  CAN USE A 4WD SHEET METAL OR DROP TO A 7.5 WIDE 20 RIM..THATS THE EASIEST OR U CAN DO MANY OTHER THINGS IN ORDER TO TUCK 8.5  ON 2WD METAL  LIKE NARROW UR REAR END OR NARROW UR FRONT FRAME..BUT HEY IT EASIER TO USE 4WD OR NARROWER RIMS

just get a higher offset

i really dont like the 4x4 fenders how the stick out so if i go wit higher offset wat would it be or if i go wit20x7.5 wat would the offset b on that