The OEM part is a Bilstein shock, so if thats what your parts counter sells then get one of those.

Note that its likely that only one bush has failed - the other may still be ok. So either push that bush out and keep it, or keep the old shock. If the new shock fails in time, you can just swap the bad bush for the good one.

I'd also get a tensioner spring as well - since they can snap suddenly and the car is undriveable without it.