Hi there,
I just had my front endlinks on both sides replaced because the original ones were on their ways out. By the way, I found out later that the replacement parts were for non-AMG cars since C63's are not officially sold where I live. The parts numbers are 2043203789 and 2043203889 (instead of 2043201789 and 2043201889). They seemed to bolted up just fine to the struts and front sway bar, but the 63's endlinks are beefier. So my question is, if it's okay to use these endlinks for a while until I can get my hands on the AMG ones? Is there any downsides beside compromising rigidity of the swaybar? Thanks.

You'll be fine if you use them for a while. They will probably break down faster under constant abuse, but, I'm sure they're fine for daily driving.

Get your hands on the AMG ones when you get a chance, but for a few weeks or even months, they won't be an issue.

Thanks for the info! Now I started to feel that the front end has more roll on quick turn-ins. That might just be me getting paranoid from knowing the car has thinner endlinks installed, though.