On FCPGroton I see listed for my 1989 240 a Bosh "direct fit" at over 100USD and a universal Walker at 50USD. The Walker is described as having 3 wires. As far as I can see my car does need a three wire. Doesn't that make Walker a direct fit as well since it has three wires? I assume that if I buy the Walker I do not need to splice or such as with a one wire universal.

What is the difference between the Bosh "direct fit" and the Walker "three wire" oxygen sensor besides the make and the price? Any other differences?

Thanks for your input.
--
'89 244DL M47 158K miles

Besides the manufacturer, the difference is that you'll have to cut and splice the connector from your old sensor.
--
1991 245, 61k miles, looking for a 5 speed 92-93 245 cheap.

on the walker 3 wire universal, there are no connectors?
is that right?
so I have to get the ones from my current one and splice.

--
'89 244DL M47 158K miles

Yep, that's what it means. There's also a Bosch O2 sensor for a Ford Mustang that works fine if you splice it, and it costs much less than the one for a 240. Somebody else out there probably has the part number info.
--
1991 245, 61k miles, looking for a 5 speed 92-93 245 cheap.

Yeah. To save on cost from making 1000000 different connectors for 1000000 different cars. Most manufactures don't supply the connector. When they do they charge you royaly for the work of having to get it. It very common since there is only about 100 different types of 02 sensors and 1000000 types of cars. But the splice connectors are included, and it only adds about 3min onto the installation.