Oh, sounds like a classic. No wonder you're so bummed... Hey, while I was looking for spare change in the cracks of my sofa, I found the cap for a RED pen I lost in '02. Would that cap work for ya? What color is your capless pen?
Sorry but my capless pen is Bic pen model 4655b, lot 32. Yours is obviously model 4655b, lot 54. That's a non-starter.