Does anyone know if the front wheel cylinders from a 620 pickup will fit on a 521 pickup?

Yes, but the 620 wheel cylinders have metric dimensions, the 521 wheel cylinders are in inches. You will need the nut, and lockwasher that goes with the 620 wheel cylinder, and the bolt with the hole that holds the banjo fitting on the 620 wheel cylinder.The bleeder fitting of a 521 wheel cylinder will not fit a 620 wheel cylinder Datsun 521 engine parts, metric fasteners.Exception, the pipe fittings on the engine are British Straight Pipe.The oil pressure switch is a 1/8 x 28 thread, a "normal " pipe firtting is 1/8 x 27 tapered thread.Datsun body parts, SAE fastners. (usually fine thread) Example, a fender bolt has 1/4-28 thread pitch.
Modified by DanielC at 3:59 AM 10/27/2008