Best thing to do is read the 1st 2, the 3rd is a compiled parts list by Dave.
http://www.rollaclub.com/board/topic/5644-4age-into-ke70-ae71-conversion-the-step-by-step-noob-guide/
http://www.rollaclub.com/board/topic/24636-process-for-getting-4age-conversion-to-xe7x-approved-in-sa/
http://www.rollaclub.com/board/topic/48731-4age-materials-list/page__view__findpost__p__501824