Hi Chris

What exactly do I look for regarding the fins?

Probably too late now as I have bought the mower but here are some shots.

[Linked Image from i3.photobucket.com]

[Linked Image from i3.photobucket.com]

Are you able to ID it for me.

I was in a bit of a rush to get a cheap 2 stroke mower for the slope issue I spoke of earlier.