THIS IS A SADDLEBAG RACK / TOP RACK ASSEMBLY WHICH  I FEEL, BUT AM NOT 100% CERTAIN, SUPPORTED KRAUSER SADDLEBAGS. I PURCHASED ENTIRE LOTS OF MOTORCYCLE PARTS DECADES AGO OF WHICH MANY WERE BMW AND ALSO SOME JAPANESE MAKES. THIS CHROME RACK WAS  IN THIS GROUPING OF PARTS / ACCESSORIES. THE MEASUREMENTS ON THE SIDE RAILS ARE : 13 AND 1/2" IN LENGTH, 8 AND 1/2" IN HEIGHT  AND 7 AND 1/2" BETWEEN THE TOP MOUNTING POINT HOLES (CENTER TO CENTER). THE INNER WIDTH MEASUREMENT IS JUST AT 9 AND 1/2" (SEE PHOTOS).  A 1973 BMW /5 WITH A LONG WHEEL BASE (LWB) IS CLOSE,  MEASURING JUST UNDER 6 AND 1/2" BETWEEN THE TOP MOUNTING POINTS. PERHAPS CREATIVE OFFSET MOUNTING BOLTS/ BRACKET MAY WORK SATISFACTORY. THIS SADDLEBAG MOUNTING RACK HAS BEEN IN STORAGE AND HAS NOT BEEN USED IN THE LAST 40 + YEARS AND IS IN OVERALL VERY NICE USED CONDITION WITH A LITTLE SPOTTY / LIGHT RUST WITH MINOR CHROME FLAKE. THE BOTTOM LINE IS THAT I DO NOT KNOW TO WHICH MAKE / MODEL THIS SADDLEBAG RACK ATTACHES. IT COULD EVEN BE INTENDED FOR A JAPANESE MODEL. I WILL UPDATE THIS AD IF I AM ABLE TO COME UP WITH ANY MORE INFORMATION.

 PLEASE EXERCISE DUE DILIGENCE BEFORE DECIDING TO PURCHASE THIS SADDLEBAG RACK FOR YOUR MOTORCYCLE.