Both come highly recommended (Dennis by me, personal experience)

At $500ish for all 12, shipped, it's a no-brainer. Also, anyone who wants to cheap out and do 2 or 4 at a time (my previous owner), it will just increase the stress on the older ones, and they are going to blow anyway. The rubber all has the same lifespan.

Make sure you work that top often!

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former: 83 300D, 97 C230, 93 400E

current: 08 C300 Luxury , 92 500SL