slowing down sequential tail lights

Just recently put in sequential tail light kit in my 03 convertible. The companies sell an ef27 toaster to slow down the blink. I see them on eBay for $10 vs $35 through light companies. Does anyone know if they have been modified in any way.....?
 
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Not trying to be cheap at all. I was looking on autotrix website and they use what the say is a modified cec industries ef27 flasher. I was trying to find out if anyone knows if the really are modified. I doubt they open them up and change them.