Q45 front calipers - one has two holes one has one?

[Spinlock]

Per the title, I got a pair of Q45 front calipers for my 240 and the left one has one hole for the brake line and the right has a hole for the brake line and another right beside it. I'm awful new to working on cars, so it might just be common knowledge what it is, but I have no idea what it is and I can't find anything about it. I checked the Q45 fsm and all the articles I could find, they all just talk about the single hole in the middle. So, eh, what is it? :| Any help appreciated.

[elwesso]

a picture is worth 1000 words...

[SUB ZERO CAR FANATIC]

The second hole you are talking about is the where the brake pad wear sensor mounts at. There is not one on the drivers side thats why there is not a hole there,same thing on the back.

[Spinlock]

Thanks for the info. So do I have to plug that? What size bolt or whatever should I use?

Images for illustration:

[SUB ZERO CAR FANATIC]

I wouldnt worry about it,its just a simple tap.......about 3/4 of an inch deep and a 12 mm. head.the only purpose it serves is to hold the mounting bracket for the brake pad sensor.