I recommend you screw the regulator back on. Righty-Tighty.
Or buy a regulator. The option Bobbo posted will work fine too.
The newer Q's have a mounting bracket that comes with the regulator and it looks like they go from $42 to $64 on Amazon depending on which one you need.
Or, you could sell it as an "already converted Q" with a quick connect hose set up for RV use only. I believe cheaper aftermarket regulators are available too.
On the other hand, if you kept the old regulator, it won't cost you anything; just remove the quick connect nipple from the Q and put your regulator back on.