You started the thread with this........
Koni part #'s
Front: 82-2516sport
Rear: 82-2526sport
and H&R lowering springs
and then said this....
Also planning to use the factory springs as I don't want to use the H&R kit because I don't want to lower the stance of the car too much, any risk with going with the the OEM factory springs matched up to Koni's once everything is apart? Does a new regular version of the springs exist that does not lower but provides new OEM or OEM like springs to match to the Koni's?
so I haven't quite got my head around which springs are on the car.
Personally I would ask for a specific reason why the mechanic wants to use other than genuine RS6 springs. I would guess that there is some difference between C5 4.2 springs and RS springs and I can't see the difference being in your favour.