Stops for front hinged bonnet?

My 59 Bugeye came with the bonnet front hinged, with a cable to stop 
it from opening too far.  Are there clever ideas on a stop system 
that  anyone can recommend?  I was thinking of two foot-long ruler 
shapes with slots and slides that connect near the radiator.  However 
I can't find a good location that works for connecting to the bonnet 
and the frame.

Michael

'59 Bugeye
'56 100-6