Will the 270 piece sets I see widely available be sufficient? As long as it's HNBR should I care about the color? Some are purple. Is this a thing where I would potentially need a metric and SAE sizes? If It matters, I intend to use these on the following vehicles: 1995 Escort LX 1999 Oldsmobile Alero V6 2000 Camry 5SFE And possible at some point: 2000 Dodge Dakota 3.9L (currently A/C removed on this vehicle). 2011 Ford Edge 3.5L V6 (if it ever has an A/C issue, otherwise this car is like new).