[NOS parts found - Will they fit?]

Thanks for the welcome, and I appreciate the insight.  There is a 280zx in the junkyard nearby, maybe I'll have to do some salvaging.  Although I had a 70 240Z in high school and I loved the feel of that four speed, so I'll have to do some soul searching.

 

As requested, here are a few more goodies.  The first picture also shows an uninstalled BRE style (I think, but unknown brand) lip spoiler.  My most coveted prize is of course, an FM radio from a later model, which will absolutely be installed.  Enjoy

 

 

[NOS parts found - Will they fit?]

Hello All,
I recently inherited a 73 240Z in Red110 with a black interior, that was originally purchased to restore. It was filled with a lot of NOS Nissan parts from the original owner. Trim, fusebox, radios, diff parts, etc.

Anyway, I am trying to identify these diff parts that were included (still in the box). I believe I have an LSD (2 pinion) and a 37x9 Ring Gear Set (4.11?), but I am not very familiar with these types of items.  Will either or both of these fit in my stock differential?  Are they worth installing?  The part numbers I have are as follows:

LSD 38420-E4610
Pat 313151
LDM55

Gear 38100-E4100
37x9

I'm not sure the 4.11 gears would be ideal for my 4-speed, but I plan on rebuilding the diff anyway, so it would be nice if the LSD fit.

Attached are some pictures, and thanks for reading