Axles and Rebuild kits?!?!

[musciab]

So, I just bought this 74 CJ5 with a fiberglass tub. Looks sweet, but needs some work. Have to wire up the rev lights and heater blower, and have to change the seals and bearings in front and rear axles. Front is a Dana 30 and rear is AMC20 as far as I can tell. So now I’m going to buy the axle rebuild kits but can’t find any that will fit a 74. They all say the kits are for a 76 and above. Now, I’ve been thinking instead of buying just the kits, maybe buy new axles while I’m at it for a $100 to 200 more. But after looking, I don’t know what to even look at because I don’t know if my current axles are narrow trac or wide trac. I’m assuming narrow because that is what was standard but I don’t know if someone changed it before I bought it. What’s the difference and better option? And don’t worry; I have plenty more questions for everyone too!!!