Re , black/purple, having received my black ones today I have to say the density of the poly is a lot more than your normal polybush. Very very firm polycarbonate. For myself, this suits as my car despite being my eveyday drive is heavily modded for track use, however for just road use I would suggest the normal purples. The vibrations do not bother me ( on an old car actually had billet alluminium mounts ) , I prefer the feel and precision it gives to the gearchange. But to those who prefer home comforts I would definitely opt for the normal purples.