Thanks for the replies.
I have seen some photos of them installed.
I had a Vespa P150X scooter a number of years ago that 1 installed but it did not lock.
Thanks again

Thanks, I have bought from JMPB before.
And of course, eBay.

Thanks,
I was told it was a 78 when I bought it and never questioned it.
It is not very common here.
I had to do a lot of searching for parts when I was working on it.

1978 Vespa Si
Frame # SIM1T*10748*
Engine # SI1M*18003
DGM 18842 OM
Yellow(?)

1982 Gilera ECO CITTA
Frame # 053*011751*
Engine # 053*68137*
Not sure if it helps but other number on down tube is
E3 47R-0045107
Red(?)

If more information is needed, I can check.
Will try to find a date of assembly.

Thanks again.

Thanks for the kinds.
I will post my frame numbers and engine numbers in the other thread.
I do have a question about my CITTA, I will attach a couple of pictures to help explain my question.
The seat has an attached helmet lock.
Is that original or a well done add on?
Of course, I have no keys.