Hello,
We apologise for the delay, we've been told that 1x 6786520021 was not able to be supplied even though we were told by the manufacturer it was in stock. Stock availability can change from the time we send the quote to the customer to the time the order is paid for an then sent to the manufacturer.
At any rate we we have received all other parts and AM00174492 will be sent tomorrow 8th October. The additional 1x 6786520021 which we didn't receive will be sent as soon as it's received, estimated to arrive on the 10th or 13th October.
Regards,
Justin