

These consist of:
M6 22mm countersunk aluminium washers - http://www.ebay.co.uk/itm/261232272529 £4.75 + £1.50 P&P.
M6 20mm red rubber washers - http://www.ebay.co.uk/itm/330942544580 £2.77.
I already had the 6mm metallic red capped nuts, purchased from Tegiwa Imports at JAE during September 2001 for £1 each.
You can get proper after market alternatives, but I find it difficult to justify spending between £20 - £25 on 8 washers!