My 05 has this setup and i would like to replace the rear shocks with an after market setup That is a standard shock..any one ..help is needed thanks.

 

I installed a set of Monroe Sensa-trak shocks on mine when I put in the lowering springs. The shocks are standard length and should work for your car with no problem.

Are you lowering your car or is it the cost of the Nivomats? If cost is a factor, you may be able to find some "take-off's" on this or one of the other Magnum/LX forums. Whenever an LX is lowered, if it's equipped with Nivomats, they have to be swapped out for a standard type shock, the self leveling feature on the Nivomats will not allow the car to go down... so there are lots of low mileage units them, sitting on shelves, collecting dust, out there