Here's the link from Marty's post where he explains he chose the Spyder over the Ghia light because it's slimmer.
"...I stepped outside the box and did Beehives and a Spyder 550 Shinedown on my 59 Roadster..."
And he posts this photo of the Ghia light - which looks a lot like the TR unit that Ed has been working on. So, did TR model theirs after the Ghia unit?