First, we have to work out which gearbox you have. If it has X shaped ribs cast into the sides of the gearbox casing it is a later M3/M4/M40 box. You can see part of those on Army's box. The fact that the tail casting of the box is painted green may make it part of the original 1957 box. The "filler" is, in fact, an air venting nipple, as Volvo calls it.
The screwed on metal cover is original to the car and worth keeping. As George says and gives links to, the gear lever gaiter is available. It has a thick felt lining to act as a sound deadener. Your felt might be missing. That mess of rags may help block sound and fumes but it could also cause the gear lever to not hold its place and so jump out of gear.
You probably told us what the current spec was for your engine and gearbox when you first started the thread but could you remind us of that? What is different from the original 1957 444 spec.
If you'd like them I can send you via a file sharing site a comprehensive pack which includes all of the PV parts lists and Green Book workshop manuals along with PV hand books. These cover yours plus earlier and later models. If interested PM me your email address.
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