You don't need a strobe sprong. I made one using a faucet gasket. Go ove to the UE forum. There is one on sale for $35. Sprong costs another $30-$40.
Here's my truck:
With faucet gasket as sprong:
As it sits right now waiting for my replacement MMM:
Post #110:
http://www.unlimitedengineering.com/...t=21384&page=3