I'm trying to remember where I have seen a setup like this in the past? But as I recall, all it had was a wire (or two) and springs.
I think you could do this: Fashion a piece of stiff wire that goes between the 2 larger closed tabs. Make it like the drawing below, then find 2 springs to go from this wire over to the other side and slide onto the smaller open tabs. Just an idea ...
Look at this HT20 manual -
http://sonnys_bolens.tripod.com/manuals/images/largeframe/2087.pdf , page 23 - That looks like your headlight bucket. Interesting, that part number is the same number as the G-14 part, but the G-14 manual doesn't show those tabs you have.