I replaced the O2 sensor in my 92 190E2.6 with the Bosch sensor from a 5.0 Mustang. The Bosch number was 13953 from Autozone and cost $39.00. Just cut the terminals from my old sensor and solder to the wires on the new sensor. Works great. I used an open end wrench to remove the sensor and install teh new one. I think it was 22mm, but when you by the new sensor, just find the size wrench in the store that will fit. Good luck.

Rod Rolfe