Locking Gas Caps
Determine if your car has the vapor emissions system:
http://www.forabodiesonly.com/mopar/showthread.php?t=183956
What does the original cap look like?
If it's pretty flat with a simple pair of lock tabs and no pressure vacuum valves in the cap, it's "early," no evap emissions
If the cap is deeper, see here
http://www.forabodiesonly.com/mopar/showthread.php?t=194100
you have the evap emissions package.
70 came both ways --if it's a CA car it probably has it.
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