Most bumpers do not actually have the winch mounted to them. A winch mounting plate is mounted to the front frame rails. There are a couple of bumpers (Hanson makes one) that the winch can actually mount to the bumper.

Gun it and run it!
1981 CJ5,258,T-176,D300,AMC 20,Dana 30,Trxus M/T 31x10.50, Rancho 5000's, GroundPounderFab front bumper, polyethylene gas tank, aluminum dash, AutoMeter gauges

What this country needs is unemployed politicians.