I wouldn't even consider buying one new...
There is nothing to wear out, and a j/y will probably hit you for less than $5.
New?
Check Mustangs Unlimited or 5.0 Resto; they might have them...
If it fits in the plug it is the right SPOUT.
You could stick a jumper wire in there, just for a temporary. But it can fall out, or corrode...
jason