Finally, I took the time to discover what I have. The two hubcaps I found at an “MG stockpile clean-out”will probably become wall art. Let me know if you would like one.
|Wheel Trim, ACE MERCURY WHEEL DISC
The Ace Mercury wheel disc was an original factory option for the MGA, and also for the ZA-ZB Magnettes, MGB and MG Midget. This was not exclusively an MG option, as the same style parts could be purchased as aftermarket parts for any model car. The difference here is that the MG parts carried an MG specific style center badge. Most had an MG octagon fitting installed. Some may have had an eared spinner similar to a dummy knockoff nut (but not standard option for MGA).
Construction is of bright anodized aluminum. The parts are light weight but not particularly strong, so care must be exercised to avoid damage during installation or removal. There are small louvers that serve as air scoops to pull in air and push it inward through any openings in the wheel to help cool the brakes. These covers are therefore right and left handed with two of each in a set of four. The covers should be installed with the open edge of the louvers facing forward at top of wheel, so it scoops in air with forward rotation.
These wheel covers could be ordered from the MG factory as optional parts during original assembly of the car. They were often installed or sold over a dealer’s parts counter as a dealer option. MGA and Magnette covers are for 15-inch wheels. MGB covers are for 14″ wheels. MG Midget covers are for 13-inch wheels. The aftermarket parts were available for various wheel sizes and with various center emblems to suit many different makes and models of cars.