To echo earlier comment, get the driveshaft too. They are different and I don't think MB carries the manual versions anymore. Price for such a transmission is in the eye of the beholder. I got one about two years ago for $250 including shipping.

Bert

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'70 111 280SE/c 3.5 (4 spd manual) - sold
'63 MGB
'73 MGBGT V8