Maintaining these Japanese classics just got a little bit easier, thanks to the boffins at Nismo.

Nissan has added the R33 and R34 Skyline GT-R to its Nismo Heritage parts program, joining the R32 as classic vehicles supported with a catalogue of factory parts.

The company launched the program last year, developing a catalogue of 80 parts for the iconic R32 Skyline GT-R.

Various exterior, powertrain, electrical and mechanical replacement parts for the R33 and R34 are now available through Nismo.

With this latest announcement, Nismo says there are 160 parts available through the program.

As well as offering R33 and R34 components for the first time, Nismo is beefing up its selection of R32 parts, which previously consisted primarily of essential elements.

The company says hard-to-find parts, such as power window switches and weather strips, have been added to the R32 roster.

Other the available items on the heritage menu are plastic bumpers, their underlying structural metal components, and door window mechanisms.