Be aware, he's right. It's an exact fit for Aurora, but I had to diddle with it to get the JL chassis to fit... I had to cut a little off the inside of the rear "bumper" where the corners of the chassis hit it, and I had to work the front for a little more clearance for the pickup shoes and the front axle. (This is a LWB car, believe it or not.) The rear screw hole lines up well, but the front is off, so my screw is in a little cockeyed. Had I just used an Aurora chassis, it would have lined up perfectly. It's usable with JL, but you have to work it a little.
--rick