Is the gas cap & surrounding ring bolt pattern on 1200s same as older oilheads?

[eakins]

i'm seling a marsee corona tankbag ( http://bmwsporttouring.com/ubbthreads/showflat.php/Cat/0/Number/635777/an/0/page/1#635777 ) that has utilizes a magnetic mount ring that bolts on to the fuel door using existing bolts. it looks like the 1200 gs & rt use the same part from 1100/1150 oilheads and thus the mount ring will bolt up the same. can any confirm or deny it is indeed the same part or bolt size?

thanks!

[eakins]

i'm using this picture as a visual.

[eakins]

looks the same as mine.

[eakins]

here's another rt without the marsee mount ring.

same looking bolt pattern.

does anyone have both and can measure?

thanks!

[Ken H.]

It's the same. I used my BigMak mount 11RT to 12GS (that bolts to the bolt pattern) and it's a perfect swap.

[eakins]

thanks ken!