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20mm for the fronts for my 2009 C2S with PASM I don't know if the rears were different. I just replaced all four shocks and found it a tough job. One of the issues was the bolt sizes denoted in all the 997.1 were all wrong for my 997.2 and I had to run out and buy wrenches. In short, I needed every darn bolt size. They used every size that was NOT included in sets sold at Autozone... I had to buy a bunch of solo wrenches. I didn't inventory them, but just get like ALL of them. With PASM on the 997.2 you have this crazy washer under the nut. It is no problem in the rear as the shaft stays put when you turn the nut (loosen on the car, then remove the shock). For the fronts, you have this crazy bronze washer that turns with the shaft. It has nubs that accept some sort of mystery tool. When you turn the nut, the shaft and washer turn so you can't break the **** thing free. I used a huge plumbers pipe wrench on it to counter the nut. To summarize, the 997.1 instructions out there are not quite correct as the 997.2 has differences. That is OK, but you will also need a tie rod puller.... you must remove one end of a rear control arm in the rear to remove the lower shock bolt. No way could I do this without the puller (get the large one). Also, you will need another floor jack for the rears... you will need to place it under the edge of the shock to push it up a tiny bit to remove pressure off of the bolt. The shock, even with the springs compressed, applies pressure on the carrier and therefore the shock bolt is jammed tight. By placing a floor jack and just catching the edge of the shock, you can compress the shock to remove pressure. Another quick tip: you do NOT have to compress the springs on the front shocks to remove them from the car. Don't waste you time doing this. I suspect, you don't need the compressors for the rears either, especially if you use the floor jack as I noted... but I only realized this after I did the work on the rears. You will need the spring compressors once the shocks are off of the car to then disassemble the strut. Ping me if you have any more specific questions. Peace, Bruce in Philly The Evil Washer, nut is removed: