Lookin for bit size or advice from experience
I understand how ya feel
I'm VERY anal about my stuff also! It's got to be Dead on or I'm Not happy with it!
If i was Gonna drill those holes,I would measure ,measure,and measure again then use a Sharp punch and mark the centers,Then drill it out with a 1/4 inch drill bit,then Bump it out to the correct size with a Unibit!
I love the Unibits for stuff like this cause they don't hang-up like a drill bit will and it makes the Job Fun instead of stressing you out!
I bought a IRWIN Unibit kit
from Home Depot that has three different unibits in it,I Love Em!
In fact if i was doing this i would Find a Scrap piece of aluminum to test the Sensor fit on,since aluminum is soft and easy to work with,wonce i found the Correct size unibit shoulder I would put tape on it to mark how deep i wanted to go just to take the Guess work out and for the ease of sight while drilling...
You could use a Piece of Cardboard for a templete,or poster board....
I usually use a Sharpie mini to mark the center of the Hole for the Punch!With the Bumpers being Black,i would use a pencil,or lay it out close with the pencil then buff the paint off and lay it out again with the Sharpei... but the pencil should get it done.... To get the layout dead on with the punch,i lay the punch over so i can see it's on the mark then while Holding it in place stand the puch up and Wack That Dude,If by chance you do get off a little ,you can Lay the 1/4 inch Bit over to make it walk to the correct spot...just take your time!
Layout is Over half of the job,so Take your time and enjoy doing your own mods
Theres nothing more satisfying i tell ya that!
Piece of cake! wish you where close i'd help ya
P.S IF the metal your drilling is thicker than the shelf on the unibit,You can dump it out from each side to get the hole through If ya follow
I've done this a Few time No Problemo ....But you should be able to get it from one side with those bumpers i would think....
In fact after thinking about it i bet those sensor holes are so Big a Unibit is the only way to go!they are Good money spent I use mine several times a year.....Just used them a few weeks ago to make custom brackets for my Gals EZ-GO 5 panel Rearview mirror