Not really an AK 550 specific tool but...
Wanted to be certain I could remove the windshield and front cover under that to be able to get to the battery and/or fuse block while on the road. The battery is in front of the dash displays and the fuse block sits on top the battery.
The AK 550 tool kit does include a 10 mm and 12 mm open ended wrench that fits the bolts holding the shield and shield brackets respectively. It also includes the proper Allen wrench to pop off the plastic rivets for the shield trim strips. BUT those 12 mm bolts for the shield brackets are recessed so that the open ended wrench cannot get in there to even touch those bolts. I could have just included a 12 mm socket that fits a 1/2 inch square drive since one of the tool kit tools has that kind of drive end but I wanted something a little more. I also have already added a small sized Allen set (for the small hex bolts on the sides of the front cover) and a multi-tool that includes pliers to the storage box but those also don't reach deep enough into the recess to grab the bolts without really damaging the bolt heads and scratching up the brackets.
So I bought this from Amazon:
https://www.amazon.com/dp/B000WJ6ZJE/?coliid=I2FT774JQXBR6A&colid=18TV0X8O5SQLR&psc=1&ref_=lv_ov_lig_dp_itI figured a 1/4 inch drive set would be plenty. This tool set includes both the 10 mm and 12 mm sockets and a few others.
It arrived today so I tried it out. Works great. Those bolts, for both the shield and shield bracket, are easily accessed and removed with this and being a T-handle makes the job easy. I'm certain this will come in handy doing other maintenance on the AK. And it's small so doesn't take up a lot of precious space.
I don't really get into carrying a lot of tools on the road, but I do like to take some basic tools.