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I got the correct key blank at a local Locksmith that the MB dealer referred me to. They were a little too pricey, but the key isn't all that rare. MB sedans also used it.

 

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I believe the sedans use the same lock cylinder.

 

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Some more keys.

Just to be clear : In the SBU photos, it shows the ignition barrel, which,
hopefully matches both doors. The matching sets with keys do come up on EBAY.DE from time to time.

 

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Keys of another type : The main battery switch key.

 

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Then, the other key which opens the hood, removes the grill and opens the battery box on SBU's.

VW Buses used a version of the same thing, which is easy to find in the VW re-pop market for $4-$8 or so...

 

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This one is the correct SBU key, as it has the female end for the battery
box studs.

 

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My Battery box is different. It uses a different key, also made in Europe. The Hellgeth's built the Stainless box, or had it built, and the locks are screw-tight units that really camp the door down. It takes a few turns, unlike the 1/4 turn
factory latches, but they clamp very well.

I managed to track down the manufacturer (Ganter) and ordered more keys - I just felt better with plenty of extras, since it is such a weird-ball fitting for the US.

Note the built-in bottle-opener feature.