Question, are all the LSD rear ends interchangeable? Im looking to swap a lower mileage 1988 rear into a 1987 and wasnt sure if the center sections are the same considering the axels are 6 bolt verses 4 bolt.

So, I dropped the tank to do a Walbro install tonight, got it down and realized that all the phillips head bolts/screws that hold the pickup on are rusty as heck. I'd like to replace them, and It'll be easier if I can pick them up at work tomorrow and have them ready to go.   It looks like it should be a 4x10mm according to the parts locator... I'm assuming that's a a 4mm x 10mm. Can anyone that's replaced them chime in and tell me what they used?

Looking for a full digital dash with speed sensor and fuel sender....let me know..thank you