I am a bit confused regarding exactly what it is you are looking for.

The picture you provide shows the intake cam. Is this just a picture you found on the web or your actual engine?

Okay, after having a second cuppa and re-reading your post I have a better understanding of what you are looking for.

The cam from the 280SE is not a good fit. It is made for a higher compression engine, and you will actually lose power on the carb'ed version. Overlap, valve timing, etc.

You need to find a matched set, or at least the same version of camshafts.

You could try these guys:

https://www.mercedespartz.com/store/1100517401/

Or failing that, buy a set from Ebay and maybe send them to Delta Camshaft in the U.S. or try:

https://dbilas-shop.com/en/engine-valve-train/performance-camshafts/mercedes/2-8-m110/regrind-standard-camshaft/2187/mercedes-2-8-m110/regrind-standard-camshafts

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