www.lj10.com

I found these new locking gas caps in eBay australia they look just like the original and will fit all lj's

http://cgi.ebay.com.au/SUZUKI-SIERRA-SJ ... 4aa6cb575c" onclick="window.open(this.href);return false;

People in Australia have been selling those on ebay quite a few years now. They do look like the original ones, but you cannot use the ignition key to unlock it. Other than that, they look nice.