Rubber insulation is essential for quiet gearbox operation. These work.
Doesn't matter about the quality, originals lasted 34 years. Price is more important. These are good quality and more important were cheaper than local retailers, even though posted from England!
Centre bush is made of hard rubber while the spring seats are pretty soft. Centre bush does need boiling water to make it fit. Once in it works well, easily outlasting the genuine item. Overall quality is 10/10. Very impressed!