'91 Pickup to '86 4Runner rear bumper
 

So for my birthday last year my mom got me a rear tube bumper from Addicted for my 1991 Pickup. I never got around to installing it, and then I wrecked it. I'm driving my grandfather's 1986 4Runner and I noticed its rear bumper is just about gone. So my question is: how difficult would it be to modify the bumper, if at all, to fit the 4Runner?

easy peasy. I'm not sure on dimensions but rear bumpers all bolt or weld up to the back of frame where the frame rails end. I would say it would go right on. and if any modification was required it's very minimal.