The 6012 is 50/40 watts High/low beam.
The 6014 is 60/50 watts high/low beam.
H6024The 6012 is difficult to find any more. The 6014 was used as a replacement for the 6012 over the years and can still be found. Mostly on eBay and Amazon.
6014The H6024 is the Halogen replacement for the 6014 and is rated at 65/35 watts.
If your headlight wiring/connections/switches are in good condition, you should have no problem using any of these with stock wiring.
Be careful when buying the H6024. some bulbs are rated at a higher wattage than the H6024 standard.