Unless you already have a set or know of a magician of a machinist, I'd strongly suggest you buy a set of body pads (bases) from Fultons of Bisley here in the UK. I don't know for sure the current price, other than it will not be cheap, but they are superb. As well as being well made, they also 'look' right.
Yes, I guess there was a small T (or maybe a few of them) in the H&H workshop during the latter part of 1943! It doesn't seem to be until that year that the side wall T's were consistently applied (earlier rifles were commonly though by no means always retro-stamped) so perhaps the small T was the first issue, soon giving way to the 'normal' sized one?? Just speculation, of course........
ATB.
Added later: sorry, just saw Peter had already mentioned about Fultons' pads!