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I've taken the liberty of moving your post to here, as it's more of a 'parts sourcing' question. Hope that's ok, and thanks for the post.
The screws you need for aluminium cast tank badges (as fitted to many Greeves models) are actually known as 'Instrument Head' (slightly domed head and countersunk), and the full spec is;
1/8" BSW x 3/8" 40TPI.
The ones I sourced needed cutting down to length; I used a Dremel with a cutting disc for a neat result. Check the length is correct first though! I used a match to poke down the hole, and also found it's worth running a tap down the threads in the tank to clean 'em up a bit. (Note; A 'plug' tap is better than the 'taper' type of course, as it gets right to the last few threads, often where the dirt has been compacted.)
I've heard that BSA Bantam tank badge screws are a spot-on match, but can't confirm it. In any case, both chrome plated and stainless screws of this spec are out there with a bit of digging. You could try the following suppliers;
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