I like front spoilers, I have a "Zender" now on my "75", no bumper.
Back in 1985, I had a spoiler on my "73", I can't remember the Mfg. It was fiberglass, and came with a rubber lower lip. It hung down to low, ripped it off a couple of times, gave up on it.
I do like the look of the "Zender", that’s the one that someone should be replicating.
I got lucky and found a used one back in 2014, it ain’t perfect, but it looks good from 40-feet. It’s fiberglass, so it’s somewhat repairable. I did some reinforcing on the back side with some layers of glass a resin when I first got it.....