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I just did a quick search for the 330e, and it appears to be a plug-in hybrid with a gas engine, 8-speed automatic transmission, and 113 HP electric motor. Given that combination, it presumably has the usual (for BMW and some other brands) 8HP transmission from ZF, which they purchase from ZF with an electric motor in the front of the transmission for a parallel hybrid configuration. The ZF product page links to a brochure that shows the electrification options (look for "Fully charged: Plug-in hybrid system" in the brochure).
Why specifically this system? Are you converting another BMW?
I just did a quick search for the 330e, and it appears to be a plug-in hybrid with a gas engine, 8-speed automatic transmission, and 113 HP electric motor. Given that combination, it presumably has the usual (for BMW and some other brands) 8HP transmission from ZF, which they purchase from ZF with an electric motor in the front of the transmission for a parallel hybrid configuration. The ZF product page links to a brochure that shows the electrification options (look for "Fully charged: Plug-in hybrid system" in the brochure).