What size screw on back of alternator 1995 gmc safari?

There's no single answer to the size of the screw(s) on the back of a 1995 GMC Safari alternator. The size will depend on the specific alternator manufacturer and model installed in your vehicle. Alternators weren't standardized across all manufacturers or even across all years for a given model of vehicle.

To find the correct screw size, you have several options:

* Check the alternator itself: Look for markings on the alternator casing. Sometimes the manufacturer will stamp information on it, including the part number. This can help you find a parts diagram online.

* Go to a parts store: Take your old screw to an auto parts store (like AutoZone, Advance Auto Parts, NAPA). They can match it to the correct size. Even better, bring the alternator if you can remove it easily. They can identify it and give you the correct replacement screws.

* Use an online parts catalog: Websites like AutoZone, Advance Auto Parts, and RockAuto allow you to search for parts by your vehicle's year, make, and model. Find the alternator and look at the diagrams; they sometimes show the screw size.

Without knowing the specific alternator model on *your* 1995 GMC Safari, it's impossible to give you a definitive answer.