Honestly idk what brand they are...I got them for free...I thought the same thing...I thought that the front ones where smaller than the back ones since oonly the font has a lot of action going on...well ima look it up and get some small sleeves...ima have to google it...lmao
OP, if I were you I'd try and find a used set of sleeves like Skunk2 or Ground Controls. You will also need new springs, which you can try and find used as well. Just make sure the diameter of the new springs is 2.5".
And also, the KYB GR-2's are OE replacement shocks. They aren't really meant to have a big drop or stiff springs. Keep that in mind when setting your ride height and when you look for replacement springs since they need to be pretty soft. Slapping Skunk2 sleeves/springs with those GR-2's would not be good..