Bolt sizes.
 

What is the best way to find out what the size of bolts are in the engine bay (without taking them out)? I tried doing part searches but that only gives me the parts the bolts go on to...like the cross bar. I can order a cross bar but damn if any ordering system will give the bolt or nut size. I tried the Service Manual as well.

I am sure I am missing something...so thanks in advance.

Try courtesy parts the have the online catalogue setup where you can click on the part you need and it will give you the part number and description for it.

Unfortunately, Nissan FAST doesn't give bolt specs, like MXX x (1.5, 1.25, 1). You're gonna have to remove and measure the ones you want to upgrade/replace.
I found that a lot of bolt lengths are not in increments of 5mm either, they're like 23mm, 17mm, etc...proprietary 5hi+ almost.

Hey, that might work. Their diagrams appear to have bolt info.

:tup:

Np courtesy actually adds descriptions to parts as they come across them so it has slighty more info than just fast

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L0L! Courtesy is a J0Ke! I ask3d dem dum ass3s about the EVAP gr0mme+ n the rear hatch back in '12 and I got no reply....L0L! Like I said...FAST provides no Bolt sizes or Nut sizes....U have 2 measure 'em urself....