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Automatic-equipped cars had a significantly larger front tunnel area. The rear of the tunnel is the same. For this reason you can easily convert an Auto car to a Manual car. To go to an automatic you may need to modify the tunnel.

1 Overview
2 Shifter
3 Driveshaft
4 Rear Engine Mount
5 Engine Differences
6 Clutch Fittings

Overview

If you convert your originally automatic 1200 to a manual, you will notice that you have barely any room between the gas and brake pedals and you have to do tip-toe driving to make it work.

Replace the auto pedals with its larger brake pedal with the standard setup that has small brake pedal and clutch pedal.

Here's all the parts you need to gather to fit an Automatic in a car that currently has a manual transmission:

'Bridge' the start inhibit wires that go to the auto gearbox
Replace the spacer in pedal box with clutch pedal (requires removal of dash and pedal box)
Knock out the clutch firewall hole blanking plate
1. In manual cars there are nuts welded from factory on the inside but autos don't. You can either put bolts and nuts thru the holes or weld some
Install clutch cable
Mount: either weld new mounts in or make a new crossmember
Replace gearbox and auto tailshaft with manual versions

The speedo cable is the same.

Gearbox mounts are different, but is the shifter hole in the tunnel is in the same place (the rear portion of the tunnel is the same).

Shifter

Shifter came with a console.

Driveshaft

The automatic has a larger spline. So use the auto driveshaft with auto transmission. Remember that B110 and B210 Driveshaft is the same. The B210 and B110 driveshafts are the same length. Only automatic vs manual lengths are different.

The spline is the same as what the larger Datsuns used.

Rear Engine Mount

The rear engine mount, also called the "transmission crossmember" is mounted about six inches further back.

or you could make your own

Engine Differences

Carburetor

For emission controls, the carb differed. However you can use any carb with an automatic.

Distributor

Auto cars had a different distributor curve for emission control. However you can use any distributor with an automatic.

Flex Plate

Automatics don't use a flywheel, the torque convertor has enough mass to act as the flywheel. They use a thin "flex plate" with has the ring gear teeth for the starter.

flex plate

Also note the crankshaft adapter.

You can use the flywheel off the A14 on the A15. The thing to look at is the back of your A15's crankshaft -- make sure it has the hole for the trans pilot shaft bearing.