you will spoil a good bike bud as its to much raise "or are you just having a laugh" :devious
ALL the suspension specialists say set the shock to minimum setting on length adjustment so going with 30mm raise will upset the handling as too much front bias.
what are you hoping to achieve ? ie are you feeling the shock is to soft etc
If you have a gen1 with sachs rear shock you can raise the ride height any way by undoing the bottom locknut and turning the other nut remember to lock it back up though...........:dunno if you do raise it you want to do it by a few mm to quicken the steering not 10's of mm's a big no-no
3 cm is a lot to jack yer ride up m8 as Lonner said you will ruin the handling may look good for a showpiece though LOL
Don't waste your money, they might make it look nice but will destroy your handling, FACT!!! Fit these and you're asking to tuck the front, It'll steer far too fast and be uber unstable at high speed, not worth it for a little bit of kerb appeal if you ask me.