Mystery Frogs

I received these older Speedplay Frogs with a used Mountain bike from a local bike shop. The Speedplays were taken in trade for some low-end SPD's. It turns out that the configuration of these pedal attachments (to the cleats, which weren't included with the pedals) is different enough from current pedals, that my Speedplay Frog cleats don't fit. If anyone out there has cleats for these pedals, or a historical note on this version of the Frogs, please comment. Some differences between these and the current models include:

• No injection point for grease -but, an O-ring on the thread side of the pedal to keep the elements out.
• No ridge on the plastic body.
• A different color (brownish) on the plastic body
• The older pedals have a hole in the middle (in which you can see a tube containing the pedal spindle) - the newer ones don't have the hole.