S1 Fulvias of all models with the cast steering column didn't have a steering lock. Bloster in Viale Monza, Milano made a period accessory to fit all S1 Fulvias which did the job, was well made and looked pretty good in crackle black with a nice brass badge and chrome plated lock.
We currently have one on our GTE and this one which is surplus was fitted for a very short time to our S! aluminium Sport a few years ago before we sold it. It is as new with full instructions in the original packaging and the only evidence of use is that fact that I scraped the paint off the inside of the 2 cast parts to give a better fit on our steering column.
Any interest please email me. If no interest I will ebay it.
Chris