I call them outer sleeves, don't know what the Germans call them..... 
First of all it looks like you have a little rust and metal loss which probably helped the cracks start.
That second photo shows the best info. Looks like the crack started at one of the welds from mount to sleeve, probably from being overstressed by the twisting motion of badly binding or too ridgid bushings.
What kind of bushings?
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1986 911 Turbo
3.3L, K27HFS, Tial 46mm, TurboKraft Intercooler, 964 Cams, Monty Muffler, MS3Pro Evo, M&W Ignition, Zietronix WBO2 Data Logger, Wevo shifter, coupler and motor mounts.
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