it is not part of the leather, it is just like the "L" on the OEM USDM steering wheels. It comes off too.... but, I don't think the dealer sells just that piece.What your looking for is an airbag cover for the altezza.I have never even seen that. yo may be looking for the whole airbag with cover. no one sells just the badge because it is part of the leather.
try searching for it on the jdm website or even ebay japan.