In my opinion, you guys are overly paranoid. Some sellers will accept PayPal on low dollar items but refuse to take the hit for the fees on high dollar items ($22 fee on the Buy It Now price for the Signal). Check out the seller's feedback. I'd say if he responds to questions and provides requested info or photos, there should be no problem.
By the way, I have three genuine Signal pump plates. Note the EXACT dimensions...
Signal "Red Stop Light" = 12"
Signal "Ethyl" = 12"
Signal "Black Stop light" = 11 7/8"
