Thom, looks like it, the 999 base came with Showa but three are specified for the early spec 749s, looks like the Sachs one was supplied with two spring rates one for the bip one for the mono, then the s had the Showa. If its any use the adjustments for the Showas are in the 999 owners manual is C&P below Rebound adjuster (1) STANDARD setting: turn the adjuster all the way in (clockwise) then slacken it 1 turn and a half. Compression adjuster (2) STANDARD setting: turn the adjuster all the way in (clockwise) then slacken it 1 turn. Two ring nuts (3), located on the top section of the shock absorber are used to adjust the outer spring preload. To change spring preload, slacken the upper ring nut. Then tighten or slacken the lower ring nut to increase or decrease spring preload as required. Once spring preload has been set, tighten upper ring nut. I found the rebound on the new shock had a very fine tolerance on the adjustment around its best working position and a very wide tolerance/did little outside that zone. It was best to find the point where it starts to work properly and fine tune from there.
