pro-team warp adapter question

[GoatBoy]

http://www.proteamdirect.com/warfeedad.html

There are two listed... what's the difference? Does one of them just include some sort of extra collar or something, or is the elbow actually different? I'm looking at getting a warp ULE or putting a rogue warp neck on my current ULE.

[sneakyhacker420]

the top one fits over 1" dia. feednecks, the second one fits inside normal feednecks (sometimes you may have to grind it down - i have one and its made to fit the large arse stock cocker necks), and the second one also fits over 7/8" feednecks, such as the rogue warp neck

[GoatBoy]

OK, thanks!