I'm going to replace mine and I need to know the size of the bolts. I will probably cut the old ones off with a gringer.

 

Well I answered my own question today. It takes 6 3/8" bolts. For not I bought plain jane carriage bolts. I got a near perfect used bumper for a pull your own junk yard for $45 + taxes. Someone had totally torn down the front of a van to get the motor and left all the front end parts laying in the back clearly labeled so I also got the right side headlight trim. Anyone need a grille for 1990 G20 I know where one is at.