What is the gap for a 2001 Ford Ranger 4 x 4 with a 3.0 engine using bosh platinum plugs?

What is the gap for a 2001 Ford Ranger 4 x 4 with a 3.0 engine using bosh platinum plugs? - 1

Should be in the owner's manual. It is also on one of the information stickers in the engine compartment.
If you have no manual, download it from Ford.

Most people would ask when they went in to buy the plugs, or looked it up on autozone.com. Otherwise, what SSP said.

Never trust pre-gapped plugs, I have seen many errors.

You should never use Bosch spark plugs in any vehicle other than ones made in Europe! Motorcraft spark plugs should be the make of spark plug you put in your motor. The Iridium and Platinum spark plugs all come pre-gaped. Using the wrong brand spark plugs can fry the coils!