F150 XL (base) rear bulbs

tshephard

Newly Enlightened
Joined
Aug 3, 2015
Messages
13
What I find:

"SYL"
TurnWTY21WJL3Z-13466-B
BrakeTailWT21/7WJL3Z-13466-D
ReverseWT21WJL3Z-13466-C

Each of my bulbs are printed SYL, then the text.
I find some FoMoCo references to these numbers, more zooming actual pictures, but even more about parts guy arguments.

So, learn me something!
What does the nomenclature tell us? (I get the watts)
Why go to an odd set of bulbs, and then not have them? (like handing it to the LED market...)
Are they halogen? I see verbal references...
Lots of subs are supposed, but little success posted, any real subs?
Supply sources?

THX guys.
 
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