Originally Posted by Retro Grouch

You have an OPC (one piece crank) bottom bracket and you want to replace it with a "Euro" bottom bracket.

In addition to the sealed bearing bottom bracket and crank you need an adapter. I'd try Dan's Comp. I'm thinking they'll have exactly what you need in stock. If in doubt, call them on the phone. I've had good luck with them connecting me to a person who understands what I'm looking for.