http://www.mantech.co.za/ProductInfo.aspx?Item=372M0560
I assume you're meaning one of those black enclosed ones though? However, the above will work and you can just connect a cable to it to your light. Even cut the cable off the broken one, so the fitting is still right.
I may even have one at home (well, at my parents home, my dad has LOTS of P/S), if you don't come right by Sat, shoot me a PM and I'll go digging when I'm there.