In the market for front bumper fillers, was wondering what experiances people have had with the ABS vs GM. The GM's are about the same price as after market. I am mainly concerned with the fit. In past experiances (especialy body related) the aftermarket fit has been disappointing. I also do not have the large reinforcing pieces behind the bumpers I have the GM brackets that replace them, that bolts to the bumper shock absorber. It has been a while but I think the fillers used to rest on the top surface of the reinforment. Now that this is absent the fillers were a little floppy where they tuck in under the bumper. Would the ABS be better as far as saging is concerned? TIA