space saver question

[HughH]

I have just acquired an unused 1985 space saver wheel and tyre as I have become nervous having my original 1973 space saver tyre as the backup in case of a flat (especially after having to use it last year )

The wheel is the standard (later style) 5.5J x 15H2 steel wheel PN 911 361 022 11 and the tyre is a Vredestein 165 - 15 tubeless space saver.

However it has a completely different sort of valve to my 1973 space saver as shown in the attached picture.

I want to leave the original 1973 dated goodyear tyre on the original 1973 dated old style steel wheel so had planned to try to put the space saver on a spare 1972 dated flat 6 Fuchs wheel as the spare in the car and keep the old wheel and tyre in the garage.

However after seeing this strange valve setup, and Porsche telling me that they can only sell the space saver wheel and tyre together and will not sell a separate tyre, I am now questioning whether it is possible for:

1. the newer style space saver tyres to be taken off the steel wheel and put onto the flat 6 and still have it trouble free; and
2. using the valve shown in the picture that comes with this setup on the flat 6 (i wouldn't even think of using a deep 6 like my other 4 wheels)

Is there anyone on the list who has done this, or knows if it is technically OK to do it - I am not confident of taking the two wheels down to the local tyre shop and asking them to change the tyre over - most of them cant mount a tyre on a deep 6 sucessfully