I'm tired of trying to find some online and locally. And making one from a borrowed heel guard looks easy enough. Did some repairs on my race glass yesterday and that was simple enough. Just need to saran wrap the guard to the glass doesn't stick to it, and use more catalyst to make it stiffer, right?
Should be lighter than metal, and the materials cost next to nothing.
Reason being is that I find that I totally use them when cranking her over to keep my boot from running into the chain.