I have a 1918 SMLE BSA rifle and would like to get a correct "period" sling for it.

I'm not looking for the real deal but a reproduction due to cost factors. I've seen a blue webbed style, a khaki web style and a leather 1907 sling advertised on ebay and all claiming to be for the rifle. I personally prefer leather slings but as the 1907 sling is also advertised to fit numerous US rifles, I don't know if this would be authentic for a Britishicon rifle. Maybe none of these is correct.

So what is the correct nomenclature, type and or color sling I should be looking for? I guess due to the longevity of the rifle, several types may be appropriate so if different periods have different slings, help in this area would also be appreciated.
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