The injector seal, not to be confused with the o-ring, is the most important. It seals the injector to the "jacket" and the o-ring seals the jacket to the engine. I suggest that you replace the o-rings and the seals.

A set of 6" hex-bit sockets will make this job a lot easier.

Oxygen sensors are pretty much standard as long as they have the same number of wires. When you splice the wires, make sure you get the correct hookup so that the brain gets the feed from the sensor!

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Chuck Taylor
Falls Church VA
'66 200, '66 230SL, '96 SL500. Sold: '81 380SL, '86 300E, '72 250C, '95 C220, 3 '84 280SL's '90 420SEL, '72 280SE, '73 280C, '78 280SE, '70 280SL, '77 450SL, '85 380SL, '87 560SL, '85 380SL, '72 350SL, '96 S500 Coupe