they (girvin) didn't make very many in the larger 48T ring coverage version because few cranksets at the time came with such rings in replaceable models. I have a crystal design rock guard though in my retro 90s parts listing in the for sale that will cover a 48T.
Checked the black. Just covers a 46 plus the "teeth". Haven't been able to figure out which box the purple one is in yet. It's got a DX group in it as well, so it better turn up.
Not my ad, don't have any idea what shipping would cost.
When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.