The bearing kit was for the MX450, part number H13-010. I don't know how much overlap there is between it and the 400 for the smaller bearings, I only mentioned it because I had noted the part mismatch in the original post. If you wanted to try it for the MX400, I'd first go over the parts list and make sure how they compared to the parts the heli needs.

The washer kit came from Heli Warehouse (http://www.heliwarehouse.com/proddet...od=PHNX1188RED), part number PHNX1188RED- it's a washers and tubes kit for the TRex 450SE. I didn't use the spacers, just the washers.