w126 orthopedic lumbar seat swap

[Rooster300SD]

I'm usually over in the Diesel section but thought I would post here
as I think these seats are more common in gas cars.

First off, is this upgrade worth it?
Bought some seats out of a Gen II 560 during the 50%0ff sale today
because they had the vacuum lumbar feature.

I got the seats, vacuum pump & vacuum pod for the trunk.
Is this a direct swap?
Also I notice that the vacuum pump from the 560 has an extra
three prong plug that the SD doesn't have.
What's that extra plug for?

You can see a picture of this over in Diesel section.
PP wouldn't let me repost the photo here for some reason.

w126 orthopedic lumbar seat swap

Thanks,
Jeff