I don't know what models these will fit, but not an uniquefire c108... They sit too deep in the head for the reflector to seat on the led correctly.
Hate to do it, I should just hold on to it for a later mod, but asking the $22 it cost me shipped.
I may consider selling it with an xml2 t6 on a 20mm noctiton and a 2.8a qlite driver... But I'd rather put the guts back in the stock pill, so would have to be the right offer...