I had the same problem with my clutch. We ended up adjusting the fingers on the pressure plate which worked in the end; though be careful, the pressure plate fingers have and allen key bolt that's pratically hollow and we broke one of ours off adjusting it. We made another one by cutting off a bolt and cutting a slotted screw end into it. If you haven't returned your old one yet you might be able to use one of those bolts if you need to. The clutch works now, but I'm not sure if I should've messed with the fingers. I talked to a professional tractor mechanic about my problem later and he said he once ran into the same problem and found out that there were two different pressure plates made. Instead of messing around with the fingers (which he frowned upon) he simply ordered the other pressure plate which fit perfectly.
You might want to talk to him to see if you can get the right one. Kurt McMillen in Trumansburg, NY. Should be in the phone book, or on-line.