I am at Lowe's with 3/4 in long bolts. I'll pull the Allen one and compare length. If it's good I'll use them if not I'll return for the washers.

 

I'm calling you next time I need to swap out my crankshaft sensor now that you know the best way to get to it.

 

Idle testing ATM

Yeah been down a rabbit hole. If you unplug the passenger spark lines and "persuade" the trans dip stick back a bit you have exactly enough room to access the bolts at like a 37 degree angle. Mind you with an extension 1/4 drive Allen head a piece of cake. Me with my **** Allen keys from HF not as easy. The out procedure is easy enough the angle for the new sensor is a challenge cold.. do not attempt hot. But easy enough without fender removal or anything like that. Patience is your friend, and a nice extension if you swap to the hex bolts is a breeze. Traded the 1in for the 3/4 in onsite at Lowe's on approx 2 min.

 

I changed mine out about 6 years ago. Was thinking with any luck I'd never have to change it out again.

 

Sorry I did not get to this sooner. At Auto Zone, Home Despot, and Lowes they have set ups where you can bring in your bolt and test to see what thread and dimension it is. They all seem to have an excellent variety of bolts as well.
As for the Harbor Freight hex key they have a set that are straight ending in a socket. they are about 8 inches long I use a 12"+ extension on top of that.. I did mine recently and I was able to get the lower one by hand but had to put grease into the hole so that it would stick to the hex key to get the top one started back in as I had to hold it in place or it popped out away from the mounting hole. Glad you got it !