knock sensor mounting position

[logik]

hi all,

pulled the knock sensor off my old JA's block and went to place it on my JB, but there doesnt appear to be any place to mount it.
after a bit of reading, i found some versions of the 4g63 block (non-turbo/?) dont have a special mount for it.

however i've noticed the earth bolt hole going into the block is similar size. has anyone mounted it here so the earth wire is in the middle? any issues?

james