I noticed that too. The bosche's body is also shorter. This may be handy for those that are limited in space. I can't fit the toyota o2 due to where I mounted the o2 bung on my half custom header, only the bosche fits. But it is deep enough for my header.
FYI/Thorley Header-O2 Sensor
When I first got my car, I used a Bosch O2 sensor, and it passed emissions . I recently failed emissions, and broke down and bought a factory sensor $98. Between tests I had put on a Thorley header. Comparing both O2 sensors side by side, I see why I failed. The Bosch is so short at the tip, that it wasn't even in the exhaust stream. The Toyota sensor is much longer at the tip, and was designed to work with the header, that was, at the time an OEM accessory part. This was an expensive mistake trying to save a few bucks. Live and learn.
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