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Do You have any Manuals for Your GL1200? Or resources...
I think the front-end (Trees/Forks) might be usable on My '76 GL1000 frame to upgrade from 37mm tubes to the 41mm tubes like Yours has.
Both have a similar steering stem, 30mm diameter where the bottom bearing fits, tapering down to 26mm diameter where the upper neck bearing fits, but what I need to know is how long Your stem is from where the lower bearing goes (top of bottom tree) to the end of the threaded portion.
The stem on the GL1000 looks to be about 9 7/16", but it isn't a very precise measurement.
I think the front-end (Trees/Forks) might be usable on My '76 GL1000 frame to upgrade from 37mm tubes to the 41mm tubes like Yours has.
Both have a similar steering stem, 30mm diameter where the bottom bearing fits, tapering down to 26mm diameter where the upper neck bearing fits, but what I need to know is how long Your stem is from where the lower bearing goes (top of bottom tree) to the end of the threaded portion.
The stem on the GL1000 looks to be about 9 7/16", but it isn't a very precise measurement.