Crash bars - missing bolt K75C '93

[Woytas]

I bought used crash bars for my K75C '93 and realized that one bolt is missing, I've got only this one:



While looking for the missed and I found two different ones:

https://www.bike-parts-bmw.com/bmw-motorcycle/K%20100/1989/K%20100%20RS%20(0523_0533_/K589-05230533-/Frame-and-mounting-parts/Engine-protection-bar/9/46_1274/46/517080523

46 71 2 303 080
https://www.bike-parts-bmw.com/bmw-motorcycle/assignment_spare_parts/46712303080

46 71 2 303 079
https://www.bike-parts-bmw.com/bmw-motorcycle/assignment_spare_parts/46712303079

The first one is on ebay in Germany, so I could get it quite easily - https://www.ebay.com/itm/123756556530


Could you please help which one I've got and which I have to buy?

Many thanks in advance!

[Laitch]

A screw is usually measured from the tip of its shank to the base of its head. Maybe that is what you're doing; the 2mm mark is perfectly aligned with the base of the head.

You've provided a diagram and parts list for a K100RS 4-valve Brick. Your Brick's screw shank measures 85mm which is the correct shank length for the crank side protection bar screw of the K100RS 4-V. Please verify the model and year of your Brick. If your Brick is a K75C, consult the correct parts fiche diagram and list.

In the USA, MaxBMW's parts fiche and Bob's BMW/Ducati show the screw shank length for the screws on both sides of a K75C as 65mm but their head designs might differ because their part numbers differ.

Somebody who owns a K75 and has installed these contraptions—regardless of their effect on engine protection—should chime in.

[Woytas]

A screw is usually measured from the tip of its shank to the base of its head. Maybe that is what you're doing; the 2mm mark is perfectly aligned with the base of the head.

You've provided a diagram and parts list for a K100RS 4-valve Brick. Your Brick's screw shank measures 85mm which is the correct shank length for the crank side of the K100RS 4-V. Please verify the model and year of your Brick. If your Brick is a K75C, consult the correct parts fiche diagram and list.

In the USA, MaxBMW's parts fiche and Bob's BMW/Ducati show the same screw shank length for the screws on both sides of a K75C as 65mm.

Somebody who owns a K75 and has installed these contraptions—regardless of their effect on engine protection—should chime in.

Good point! I've seen so many of these diagrams. In K75/3cyl both screw have the same length https://www.bike-parts-bmw.com/bmw-motorcycle/K%2075/1984/K-75-85-0562_0571_/K569-05620571-/Frame-and-mounting-parts/Engine-protection-bar/9/46_1274/46/517380562 so I need two 46 71 2 303 080.

Many thanks!