Geoff

Yep, seat belt light. My '85 has that light in place. Well had, anyway. I'm tearing down for a resto custo mod. But 4174 was a basket case anyhow.

That CHMSL looks like the ones used on the roll hoop of C4 Corvettes (1986-1991, plus all ZR-1). There are 'vette owners whom have swapped those halogen bulbs for cheaper and modern LED solutions. Search the Internet for C4 ZR-1 CHMSL LED and that should get all the necessary information to make the conversion.