FF01 Spare Part Options

[drawde]

I'm rebuilding a second-hand FF01 kit, and I'm missing a few parts that don't seem to be available anymore. I'm not too worried as they're just spacers, however as I don't have any reference parts I was hoping someone would be able to give me the dimensions so I can find some suitable alternatives please?

The parts are B4 and B7 - circled red on the attached photo. B4 goes on the reverse side of the reversible rear body mounts, and B7 goes between the upper rear suspension arms and the upright.

Any other suggestions for alternatives or replacements would be very welcome too!