Damn, I got excited when I read the title and thought someone had found the genuine umbrella that fits into that little sill compartment.
Your cover does sound like it will be a positive addition to your speedster lifestyle though [emoji1360]
*edit* I feel silly now, 9-a-part sell them new so they're not rare.
https://rover.ebay.com/rover/0/0/0?mpre=https%3A%2F%2Fwww.ebay.com.au%2Fulk%2Fitm%2 F182643161209