Thats right. Any 22mm deep enough should work.
I also had to (with a hammer) bang the 'engine lifting bracket', bolted on the end of the block, back out of the way a little to get it down on the sensor.

__________________
-Marty

1986 300E 220,000 miles+ transmission impossible
(Now waiting under a bridge in order to become one)

Reading your M103 duty cycle:
http://www.peachparts.com/shopforum/showpost.php?p=831799&postcount=13
http://www.peachparts.com/shopforum/showpost.php?p=831807&postcount=14