I had sway a way coilovers on my last truck and used a spanner wrench from my dirt bike. Lol. Not a perfect fit, so I put a rag in between the wrench and coilover to prevent scratching. I think the spanner wrench was like $10 at my local dirt bike store. Had 2 size options, one on each end.
Go to lowrange offroad n watch the video of adjusting coilovers using I believe a 5/16 punch to turn the collar . Or something that has the same outer diameter like a round shaft screwdriver that fits in the holes.
Like mentioned before, try a motorcycle shop. We use spanner wrenches to adjust rear shocks.
Ive been to many shops, auto, home depot, lowes, and you ask for a spanner wrench and they look at you like you just called their mother a bad name...
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