These actually look pretty heavily built... IDK how "hi-excursion" they need to be for a Sa-10 but they might be something to look into... pricey tho...
I don't think anybody uses grills anymore for subs, but if you wanted something nice might reach out to that Russian guy on the forum that machines grills.
There's some bar style type exactly what shredder stated/.linked at sonic electronix in either chrome finish or black. I'd post a link but my computer is ******* up whenever I look at pics...