Hi Kent
Been down this road and there is nothing I found that is a straight bolt-on.
240z has a different distance from the wheel mounting flange to the backing plate mounting face so although the disks will fit, the caliper mount bracket is unusable.
I have used 280ZX rear brakes with 'Annette' style calipers.
The 280ZX also supplied the longer wheel studs.
A custom pair of caliper mount brackets and custom handbrake cables.
Not yet investigated but a possibility is a C210 coupe I have access to which looks to be near identical in the rear end and already has 270mm disks.
It really depends on what use you have in mind. Our C110 is a 'regularity' class competitor so doesn't need huge brakes.
270mm by 20mm ventilated front disks with four piston calipers and 270mm solid rear disks with 'Annette' calipers have proven adequate.
HTH
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