Where to find 73 Duster bumper cushions.

Thanks for the help with finding rechroming sources earlier this week. Now I am trying to find out where I can get some bumper cushions. Note that there were two types. One for use without the chrome bumper guards, one for use WITH the chrome bumper guards. I need a complete set for use WITH the chrome bumper guards on a 73 Plymouth Duster 340. A couple of mine would have been reusable, but the bolts are shot.

Thanks,