Most of this is applicable to the JH engine (1.8L 8v) but much of it covers more related engines. This is a running list that will be updated often, I’m measuring things as I go.

Water Pump

Pump to block – QTY-2 M8x1.25x30mm, QTY-2 M8x1.25x50mm. all are 13mm hex-head drive.

Water pump housing – QTY-8 M6x1.0x18mm flanged. 10mm hex-head drive.

Pulley bolts – Non-A/C M8x1.25x14mm socket head (Allen) 6mm drive.

Freeze Plugs – 36.5mm diameter. Zerostart 3100034 block heater.

8v Intake Manifold

QTY-3 M8x1.25x50mm, QTY-3 M8x1.25x80mm, socket head (Allen) 6mm drive

Cold Start Valve – M6x1.0 (unknown length, but likely around 15-20mm)

Vacuum lines are 4mm, 3/16 used in the US is a close equivalent.

Valve Cover

For use with ABA rubber valve cover gasket – M6x1.0x32mm, 10mm of thread on each end. No shoulder in the middle.

Transmission

Speedometer cable – M7x1.25x13mm 11mm hex-head drive (This size is very unusual and almost non-existent)

Bumper

US bumpers have M12x1.5x22mm with 19mm hex-head drive.

Euro bumpers have M12x1.75 pitch

Brakes

Bleeder valve M7x1.0x32mm, Speed Bleeder (built-in check valve) is Dorman P/N 12708

Rotor screws are M6x1.0x14mm with a flat head – FH (countersunk), various lengths are available. Drive is P3 Phillips. Do not use a standard P2 Philips on these – the head will strip. Similar screws are also used on Honda/Acura, but they use a JIS spec drive. Use anti-seize when installing, especially on the bottom of the head. Late model VW/Audis use a similar part, 16mm long, with a Torx T30 drive instead of the Phillips head.

Wheels

Ball Seat (Spherical) R12 , 17mm hex-head drive.
Steel Wheels: M12x1.5x19mm
Aluminum Wheels: M12x1.5x23mm

Aftermarket wheels are typically conical seat. If you are running wheel spacers, you will need to get longer lug bolts to suit the extra thickness.