if i was doing it. and taking into account how covers never get along with rods sticking out of the body panels.
I Would be considering buying a motor unit from a gen 6 Celica or mk2 MR2
im sure theres plenty others that would fit the bill. but those are the ones i know from personal experience, the point is.
1 - they are the style that has a motor and retracts
2 - the motor is not in line with the mast. therefore it is positioned a bit further away from the bodywork than the universal types. (
see this listing to get an idea of what i mean)
in the M100 you probablyt can put a celica mast with the motor tucked behind the washer fluid reservoir. the whole stick up and retract electronics are also something you can get from a scrap car and just connect the signal wire straight from the radio...
anyways i really dont get the impression your the type of person to do something like that... and well.. the reason the answer is so ready for you... its because the mast on my NA is also broken. and i done your research as well.. im just not financially ready for the investment, mainly because i havent listened to radio in my car for.... probably 6-7 years now