peanut head plugs

vitamindart said

I was to the understanding the ZFR5N was for both style heads, just remove the crush washer on the drool tube heads.

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That is what I have read and understand too. But the difference I length is a lot!! Pretty sure I have had both plugs in peanut heads. Just wondering, 3/8 of an inch is a lot!!!
All my slants are somewhat woreout too!!!!!