Hi Folks, this is going to be a double barrel question

, whilst tinkering in the garage today as you do, i decided to take off the rear shocks on the 1000cc Kat, and removed 1 side from my 750 kat to compare side be side, neither are original and both are different lengths

, the 1000 shock is 30mm longer so can somebody tell me the correct length they should be (presume they are the same on standard kats in larger version

).
And hopefully with this info i'm going to fit the Wilbers 632TS TwinShock piggybacks i have, but thats where i'm stuck as i have searched the tinternet on the how to adjust them, unfortunately for me they have so much adjustment and i'm not sure where to set them for a moderate start.
Unless somebody has any instructions please

cheers Kiwi.