if you are buying remanufactured brake calipers and your old banjo bolt is to small in diameter to bolt your brake line to the caliper you will probably need to get a banjo bolt from a 71-76 gm fullsize car.
i purchased 2 sets of remaned callipers from different auto parts stores and spent 4 days trying to find the correct banjo bolts to fit when i finally called my friend who collects 71-76 gm cars and asked him what size banjo bolts they had and by golly answered my 4 day question with a 2 second phone call.
the bolt i ended up using was a 2" 7/16"x 20
also the banjo ends on the new brake hoses are thicker than the stock ones thus giving you less evposed threads on the bolt.
ill tell you i could have choked someone but its the remanufactures fault not the parts stores.