I just ordered a set of 200 x M6 and 150 x M5 countersink rivnuts and the same amount of stainless steel dome head bolts to go with them (for fitting the transmission tunnel panels and bodywork) from
Orbital Fasteners. The set has been delivered in 24h to Sweden, and costed me, shipment included, less than half the price I would have paid in the local metal/hardware store in my town. Definitely a good address I can recommend too
