I know a little about them. The 73 thur 76 are plastic and never rust. They are also cheaper, but the fit isn' t exact. so their are differences. I have a perfect set of rust free ones (steel originals) but I still might need them, check back in a month or so when the wheather gets better so I can get my buried mopar stuff back into day light. I think the plastic ones would be fine, if you can find them. Good luck