Do they need nuts? Normally the sensor caps just screw on. You want to be able to remove them to pump the tyres up, so it needs to be easy. ;)
 
Got a pic?

Not you @Nodge68 ;).

From what I can see the outer sleeve is the "nut" that clamps it in place on the rim.
J
 
As can be seen in the picture below, these are the same as the Peugeot ones, the hex on the valve stem is the nut for securing them to the rim. remove valve cam, unscrew hex headed sleeve, insert sensor and stem from inside of rim out to outside, fit outer sleeve, fit tyre, inflate tyre. At some point in this process you need to do witch craft with the computer to excite/activate the sensor and then pair it with the car's ECU.

s-l1600.jpg
 
As can be seen in the picture below, these are the same as the Peugeot ones, the hex on the valve stem is the nut for securing them to the rim. remove valve cam, unscrew hex headed sleeve, insert sensor and stem from inside of rim out to outside, fit outer sleeve, fit tyre, inflate tyre. At some point in this process you need to do witch craft with the computer to excite/activate the sensor and then pair it with the car's ECU.

s-l1600.jpg
 
As can be seen in the picture below, these are the same as the Peugeot ones, the hex on the valve stem is the nut for securing them to the rim. remove valve cam, unscrew hex headed sleeve, insert sensor and stem from inside of rim out to outside, fit outer sleeve, fit tyre, inflate tyre. At some point in this process you need to do witch craft with the computer to excite/activate the sensor and then pair it with the car's ECU.

s-l1600.jpg
I'd love to retrofit the TPMS, but I don't know if mine is late enough to have all the wiring in place for the sensors, but I guess I could check.
 

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