If you have a Vanilla mod it should work. The Vanilla FC sells is 20x1, and the brass Paps FT sells is also 20x1 but the cap and switch are a little shorter.
I have 3 Stingrays and a Paps clone. I haven't tried their caps, but technically they should fit. Probably the hybrid connector of the Stingray X fits, yes?
Those 3M samples are awesome, I already want to order more but I figure I should space out these orders my at least a month or so 
*kiss*
I have loved the Vanilla mod for a long time, but I love the stainless original version. All these dang copper versions its like the original never existed. How are you gonna have a "Vanilla" copper mod in the first place? 