CHECK OUT THE VIDEO...TRY DOING THAT IF YOU BUY THE ONES ELSEWHERE THAT HAVE DRIED OUT FROM YEARS OF STORAGE..THEN PUT IN FAKE PACKETS.
β˜†I HAD A TIN BOX FULL OF THESE THAT I BOUGHT A FEW YEARS AGO TO RESTORE MY COLLECTION OF VARIOUS PUMPS BUT NEARLY ALL GONE NOW β˜†
Easy to fit supple leather. This is because they are NS not dried out NOS..New'ish Stock not 50yr old New Old Stock ! 
The cheapest on eBay that are supple leather and the best quality and made in England.
β˜†YES WATCH OUT FOR THOSE DRIED OUT ONES COMING IN FROM CHINA IN PACKETS WITH FAKE LABLES ! BEING SOLD AS ORIGINAL AND STATED AS MADE IN THE UK FROM LOCALLY SOURCED LEATHER,HOW CAN ORIGINAL 1950s/60s ONES HAVE AN EMAIL ADDRESS ON THEM ?....IT IS SO OBVIOUS THAT THEY ARE FROM CHINA..THE LABELS ARE DEFINATELY MADE IN THE UK THOUGH β˜†πŸ˜†