Was thinking the same. Wonder if Ford went full steam ahead on production thinking they'd be used the entire generation but found out that yellow bulbs with the clear lenses wouldn't cut it or left them open for lawsuits. Purely speculation.
Scott
'
Camano' 1986 F250 Supercab XLT Lariat 460/C6
'Chanute' 1980 F350 C&C 400/NP 435 - Gin Pole
But there ain't nothin' wrong with the radio