Factory 6" rear lift blocks?

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I was wondering what years/models had the 6" blocks in the rear? I've heard that some came with 5". I plan to put them in my Ford to replace my stacked 4" +2" blocks
Thanks!
Jerry

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My Dad has a 1995 2500 Club Cab blue over gray 2wd, and she's straight piped! I drive a Ford Diesel. What can I say I like 'em both!