Rear main seal type for Stroker

Look into an Eagle assembly. I used theirs and I have a 1 piece rear main. They make a very comparable kit to the link you gave.

You need a 1 piece seal.

I would look around, do a google search and check out Ebay even.

For $100 more on Ebay they have kits with forged cranks and H-beam rods. The Summit kit is a cast crank and I beam rods.

I would get dished pistons also and get the compression down if your running it on pump gas or ever plan to run any form of boost. This is also a good reason to get a better crank and rods now. Not sure what Probe charges but they have kits like the one from summit or the next step up, but you get a choice of compression ratios.