Note: We don’t have any of the GL series as they weren’t sold here… we are trying to acquire pics. Here’s a pic of the differences between the original CX500 Comstar wheels, the Reverse Comstar wheels and the later Boomerang Comstar wheels:

To more clearly see the difference between the spokes of these three wheels, here’s a closeup of the original Comstar fitted to a CX500:

…the Reverse Comstar with it’s different aluminium spokes. These were often black with polished raised edges:

…and the Boomerang Comstar fitted to the CX500EC, CX650ED and Turbos (and other models besides, but for the twisted twins that’s it):

The original CX500 Comstars come in 19″ front and 18″ rear, the Reverse Comstar comes in a 19″ front and 16″ or 18″ rear and the Boomerang Comstar is 18″ front and 18″ rear (17″ rear for the Turbos). In terms of width, the Boomerang Comstar is slightly wider at 2.5″ as opposed to the 2.15″ of the other two types. The CX500 Turbo got gold Boomerang Comstar rims, the other models with the Boomerang Comstars got silver.
Boomerang:

Reverse:

Comstar:

There’s a notable difference in weight between the various types – and lighter is better for handling – for the figures, see this page.