How much would it run me to convert my 1985 300D Turbo with AT to a manual transmission? Provided i bought the transmission, clutch, clutch pedal, etc
1.) How much does a standard 4 speed trans cost?

2.) How much would a 5 speed trans cost? Speaking of which, I see that according to my Hayne's manual that the 5 speed was an option for these cars. How come the w123's that came with manual transmission had 4 speeds?

3.) Are these transmissions hard to find?
.....And had it installed by a shop? Just wondering what the total cost would be. What vacuum components would need to be removed? I found R. Leo's writeup but didn't see how much it ended up costing him.

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1985 CA 300D Turbo , 213K mi