XK120 Rear Wing - disc vs wire wheels

Can anyone tell the physical difference between the XK120 rear wings for disc wheels vs wire wheels? I need the ones for wire wheels and there is one on ebay now but I don’t know how to tell if it is for wire of disc wheels.

I’ll go out on a limb here as say the the actual wing is the same. The difference being the brass beading on the opening for cars without spats!
That only pertains to the 120. 140’s are different.