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Also see: Lowering, which focuses on B110, but most information is also applicable to B210.
B110 vs B210 strut tops:
Using B110 strut tops in a 120Y lowers the front by 1 1/2". The PCD is different (slightly) so I knocked the studs out, elongated the holes with a die grinder, put the 120Y studs in. Gave them a zzzap to stop the moving during assembly. The hole the in the B210 strut tower needs to be opened up, I used a set of vice grips. Went a little at a time, about 4 times around.
120Y lowering on the cheap
07/06/2013 update by L18_B110:
I just fitted a set of B110 strut tops to a B210 and found it slightly different to the above info.
PCD is identical - no mods required there. The B110 studs fit straight into the B210 holes. B110 studs are smaller diametre, M8 versus B210 studs M10 but that's no problem. I just used a washer under the nuts.
The centre hole in the B210 strut tower does need to be opened up from 80mm diametre to 94mm. I cut it carefully with an angle grinder with a 1mm cutting disc after marking around the opening. Photo shows the material removed.
This mod lowered my car approximately 30mm. The 1200 strut top mounts the shock top 5mm above the strut tower, and the 120Y mounts it 25mm below the strut tower.
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