Here is what came on my '38 SS.
The arms have a slot in the end that accepts that loop on the blade, and one of them had that triangular rubber plug through it to hold it on.
The shorter one is 9" long and made of stainless steel, marked MADE IN ENGLAND, nothing else.
The longer one is 10" long and made of brass, painted black, marked MADE IN ENGLAND and PATS 523177, 523486, 544841, 615500, OTHERS PENDING.
Could it be original?
Above for comparison is a 10" one from my XK120, which has a different clip mechanism.