Mohuska:
I searched for same thing. I bought grommets from Mid Atlantic Rubber for front bumpers and roll bar. They have lots of sizes. I cut larger grommets down for front bumpers and hid cut line below strut. Did the same for roll bar but glued them together. They have all different diameters, widths and how much will cover the body opening Here is the link.
http://www.midatlanticrubber.com/grommets.htm
Robert C.