The steel cowling I've for sale at his time is made in Italy and dates back to 1963.
It was mounted in a Piaggio Vespa 150 scooter, and I assume it can fit other Vespa scooters of the same time.
This metal cowling is particularly rare because, later, the same cowling was made by plastic.
Please ask any Info BEFORE you decide on your purchase, and I'll try to answer any of your questions, including the measures.
The cowling, however, is in excellent structural conditions: it has no abnormality and no dents.
Please, if you are not sure it fits your Vespa, do no buy it.
If interested, please email me to angelo.massimino @ tiscali dot com and I'll show you pictures of the cowling.