I have purchased a new (to me) set of 1 way nitrons so I am going to swap them over, if I keep the ride heights the same there should be no need for a new geo would there? I doubt i have time to get it done before Donny 
I am taking a bit of a guess but I would say u would need a geo. Chances are you are not going to be at exactly the same ride height and you will no doubt disturb something changing them over.
i’d say get a basic geo done, also depends on how you’re going to match ride height. New and old shocks will settle to different heights even if they started as the same length on the bench.
I’ve cut a piece of corex board at 125mm and keep it in the car so I can keep a check on ride height … takes 30 seconds to check all 4 corners .
I will carefully measure the ride height first and set it backjust the same after a short run to allow it to settle correctly, thikn your right though if I get time I run it in to EA for a quick check
yeah for what �80 it’s worth knowing all the wheel point in the right direction after a 4 figure sum on upgrades