Which pressure plate do I have?
 

So I have a pressure plate I've been putting off installing. I bought it a while ago and now I can't remember which one it is. It is an ACT but I'm having trouble finding if it's heavy duty or extreme. Only visual difference I can find from looking online is two cut outs on the HD but a solid wall on the extreme as seen here
Heavy duty
http://www.gomiata.com/actclutkitst2.html
Extreme
http://www.gomiata.com/actclutkitst.html

Mine is solid without the cutouts so assuming these pictures are accurate I guess I have the extreme pressure plate? Can someone confirm?
I read somewhere the number on the plate will be stamped with a number followed by HD or XT but as far as I can make out there are no letters. Just numbers.
Thanks for any help