My car was equipped from the factory with RPO P02, simulated wire wheel covers. A flat blade screwdriver was part of this RPO but it was long gone from the car when I bought it in 1998, Fortunately, my other CORSA convertible still had this original tool. Cal Clark was also very helpful, by providing a picture of a NOS screwdriver from a dealer accessory wire wheel cover kit.

After a few months of searching, I found a near-exact screwdriver on eBay. Dean Richardson did a nice job of restoring it.

The picture shows the correct mounting location inside the base of the jack.