OP, I just replaced my lifters with this part 51247250308, they are 40ish bucks each for the OEM, but there is a listing on Amazon I got mine from that are an OE supplier of the part for 23 or so each. Here is the link, they work fine if not a little too overpowered.
My old ones were loosing pressure, the trunk would fall on my head and come crashing into the car when I tried to close it. Worth the cash, not sure if the 40 dollar ones are exactly the same as what I got but I'm happy.
Here's a link if you are interested:
http://www.amazon.com/gp/product/B00...?ie=UTF8&psc=1
Cheers