Welcome to Geekhack!
If the seller says it's rubber dome it's probably rubber dome.
Sigh. I thought as much. I was hoping one of you guys might be able to reply along the lines of "Oh, that seller doesn't know what they are talking about, that part number indicates it is buckling spring"
Oh well, back to model m hunting I guess. I'd love to order direct from Unicomp, but the combined cost of the board plus shipping to Aus really kills it :-( Unless there are any suggestions for cheap shipping to Aus?