Genetics question on Sour Diesel (Chemdawg's)

I've been looking into the heritage of Sour Diesel and came to the conclusion that the parents were

'91 Chemdawg x Massachusetts Super Skunk x Northern Lights

However, Northern Lights strains range from Northern Lights #1 through #11. I am trying to figure out which Northern Lights Strain was used in particular when Sour D was accidentally discovered. One of the NL strains that was a heavy Indica (possibly #1 because it fits the description and is supposedly the second-best NL strain and Sour D is the one of the chronic buds in the region, so would have likely had dank parents) would make sense genetically for this type of Sour D's heavy indica. MSS is an Indica crossed with a Sativa-dominant hybrid, and '91 Chemdawg is supposedly a Sativa-dominant hybrid; therefore, a strong Indica feeling would result from a very heavy Indica tendency from the Northern Lights, correct?

Additionally, I researched for quite a bit on the strain Lemon Joy but couldn't find anything concrete as far as genetics or dominance. Any info on that would be much appreciated! (Currently I'm assuming it's a pure Sativa for my genetics)

Please let me know if you know, and please give me your ideas on maybe which NL it could be.

It's very important as it ties into my own grow line genetically, so please no false info or jumped-to conclusions!

Thank you!

I've always read and thought it was Sensi NL#1 used in the cross. This is backed up on line, but sour should end up being 60 sativa/40 indica. Our sour is very stretchy (of course), it seems to be chem dominant in structure and end result. The whole DNL and RFK skunk lines are where I am confused with the Sd genetic line, it seems a lot of specifics were never properly documented with Sour, Chemdawg, and OG, so some conclusions on the genetics have just been jumble fucked together in descriptions.