Remove the alloy adjusting knob from the shock. Now use a few pieces of masking tape under the tower brace. Now try to place the brace where it will mount once a hole is drilled. Take your time to line it up the best you can. The top of the shock shaft should put a mark in the masking tape once you put a *little* pressure against the tape. Now use a center punch and a smaller drill bit to drill a starting hole, I used a 1/8" bit. After you drill the starter hole remove the tape & place the brace back to see if your off oneway or another. I then use a 7/8" step drill bit to enlarge the hole. Now use a small round file to clean up the metal burrs & some black touchup paint to paint the fresh hole. If your not centered fairly well you may need a larger hole. Touchup auto paint can be pickup for about $5 to $7 the step drill bit can be pickup from go old HF for about $3 to $5.
You can just use the step bit to drill the starter hole too.