I have of those original locking caps. I don't use them because the gaskets are cracked and because I drive my cars. More than once have I found my flip lid open and my aftermarket cap locked on my filler neck. I bet folks are looking for those hi dollar locking caps and I'm not going to let them steal it from me.

I bought mine around 2003 and I know I didn't pay 600 bucks for them.