I've got a 15mm Bing for sale that was on my Magnum. It is the genuine Bing, not the knock off. It comes complete with an 86 jet.
$75 shipped to your door!
I've got a 15mm Tall intake for Two speeds, originally from a Magnum. The tall intake matches right up with high torque magnum cylinders and also clears your ZA50 nubs.
IF you want both, I'll sell them to you for 80$ shipped and throw in this fully functional (if slightly old) Bing high flow filter!
E-mail me or post here!