I've seen quite a few sales invoices, and sales writers were notorious for spelling errors, and using a strange form of shorthand, as they typed up the receipt.
I'm guessing that "Exth. Ext." are the chrome exhaust tips (exhaust extensions), "Guages & Clock" is supposed to be "Gauges & Clock", and "Tilted Steering Wheel" is simply tilt wheel. "EZ All" may be tinted glass all around, and "Air Cleaner" may be the HD unit that used a foam filter. Some of these sales invoices were typed up by non-automotive people, so it wouldn't surprise me if "Ret H.D. Lmp" are the hideaway headlights.
The real truth would be the original invoice (from PHS) showing the codes. [img]<<GRAEMLIN_URL>>/smile.gif[/img]