Yea, I actually had the Release Lever and Cable for sale on Ebay not too long ago.
Once you take off that trim, you will see how easy that lever releases, 4 screws I think.
Then the end of the cable in the gas cap simply has a ball on the end that fits into the release.
I should think it would be simple to use any old cable as long as you can secure it in the cap mechanism.
[This message has been edited by DKcustoms (edited 04-01-2014).]