You are looking for a 912E (to be exact). This is a rare car (basically a 911 with T4 motor). The tranny is geared for the T4, but is a 915 tranny. Jake Raby has a daily driver 912E, and a extra tranny he is going to use for a future T1 GL project.
www.aircooledtechnology.com
To get the tranny in the T1 bug@5speed is a good way to go.
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1970 T1 W/MassIVe 2913cc RAT/?EFI? w/direct fire (very soon) and 915 trans
1962 SC 1776cc SP 944NA brakes, 993 wheels
VKG