6.1 Valve spring failure

are those the locators fitting the LS1511 springs? And need the shims as well.

http://www.summitracing.com/int/parts/man-42324-16/reviews/?filterReviews=FiveStar

Shims. Do i need all 3 different heights? Do I need them at all?
http://www.summitracing.com/int/parts/man-02231-50/overview/