For a 500 SL (any type) with manual: 20 hits
A couple of 129 and a couple later type's, all saying in the ad: manual
Checked the pictures of the interior: all automatic boxes

Looked for a 420SL with manual: no hits
Also no hits for a 380 SL with manual.
560 SL with manual: no hits

www.mobile.de is the biggest site (its german)for 2nd hand Mercedesses in Europe.

A ORIGINAL 80's Mercedes V8 with manual is i think the same as the Yeti: a lot of people heard of them, but no-one has seen them in real life, up close.