there is a chopper company that makes them, they advertise in the horse all the time. They are like $500 a set. Same company also makes perimeter disc brakes for wire wheels. I am drawing a fucking blank on the name.
I don't know if they are stock to that bmw/dnepr or not.
I have seen that bike around. A guy I used to work for in the city had it's ural cousin - a cammo painted sidecar rig with a dummy machine gun.
the BMW copies that come on the Chinese or Russian bikes are ok, they even have decent leverage, unlike the stock inverted levers fitted to the 30's brit bike (yeah the ones on a Brough Superior are for chit) and can be had very cheap
I have some I'd offer you but I wouldn't even know where to begin looking for them at this point
I even have some original BMW levers too but they would set you back a small fortune
poke about on ebay and I am thinking a few of the guys who sell these bikes new also have parts
some of the guys who are dealers for the Chinese or Russian bikes are quite strange to deal with
a buddy of mine told me that when he helped pull apart the engine in his friends cj70 they found that the factory had used cereal boxes to make gaskets and that a number of the washers were coins with a hole punched in them.
nothing wrong with a pair at twenty.... they are decent but not first world class quality, so buy a spare while you are at it, besides levers get broken often and you will have to likely do some cable work to make them work on your bike
regular levers work much better and good heavy chrome plated cast brass ones last much longer
the bar ends make routine and regular cable maintenance more tedious
you know, injecting dri-slide and greasing the cable ball ends
then don't forget you have to make holes in your bars for the cables to exit from them and deal with any conflicts you may or may not have around the busy or barren trees
I've seen a few cafe types with them but I usually seem to manage forgetting mirrors on my bikes
the ones I've seen with mirrors just used short stem clamp on type mirrors either under or over the bars
often I forget to wire up a brake light too
just my two is all
I'll have to dig up pix of some genuine Magura racing levers I had a while bike, a pair of them didn't weigh a pound including perches
the vintage BMW race guys tell me they only last a race or two, if you are lucky