Where did you get your front disc conversion?

Can anyone tell me what the differences between the $105 kit & the $495 "wheel" kit are at Scarebird? When I send them questions they only answer part of them. I am starting to lose confidence in even using them if I can't get a straight answer. Any help is appreciated. Thanks.

http://ecihotrodbrakes.com/dodge_plymouth_discbrake_conversions.html

There is some pictures on the the first page of this thread.