Here's the other version of the Leader Class upgrade for OP from SND:
http://www.bigbadtoystore.com/bbts/p...00&mode=retail
http://tfsource.com/snd-kit-for-cw-o...o-vitalis-kit/
People thought Beelzeboss ripped off the original creator of that upgrade set. This is his mass market version. I can't say what Beelzeboss did, but it's pretty damn close. I'm assuming other sites will get this kit later on.
First person I'd check with for any upgrade kits is Slayback, of course. Prices in CAD. Otherwise Id go to chimungmung too, he's in USD but he ships really quickly (got my last shipment in 3 business days, and that's from China) and you don't get dinged for customs.