Hey, I use ancient devices like that
I bought one from pccables, it's in the mail so to speak right now.
Link.
Don't know what you're needing one for, but for me it's for a racing controller, TSW uses this converter so I'm going to. Just not going to buy from them for twice as much. Heard of a few guys using the Radio Shack one, it worked, but lost their split axis pedals.
Glanced at newegg, didn't see that one mentioned. Anyone else find it?