To answer your question, the GR2's will work with the stock tophats, they are an OEM replacement strut. There are stock or aftermarket top hats available. Stock ones online range from $20-$60 each. At that mileage I would recommend changing the spring seats as well:
#3 in the first pic and #7 in the second pic. They are super soft durometer like 30A-ish. You can buy them at an online dealer site, or if your dealer price matches online like mine does, get them at your local dealer. I just picked up a set of 4 for $44.
You may also want to inspect your bump stops while you are there.
The front top hats have a bearing which wears out, the rear are just solid rubber.
Aftermarket options include everything from full camber plates front and rear to "group N" mounts which are a harder durometer.