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**jocko** · 09-05-2022, 08:29 PM

NL2 was a factory RPO, not a dealer-installed option - but it was available in both 71 and 72, so you should assume yours is indeed original. 71 assembly manual excerpts for ref:

09-05-2022, 08:29 PM	#53
jocko Senior Member Join Date: Oct 2009 Location: Godley, TX Posts: 17,937	Re: Removing 4 Repair NL2 Aux Tank NL2 was a factory RPO, not a dealer-installed option - but it was available in both 71 and 72, so you should assume yours is indeed original. 71 assembly manual excerpts for ref: Attached Images