when you get a chance maybe take a pic of the item that broke to confirm.
https://www.amazon.com/HPI-Racing-1426-Cover-Plate/dp/B000H7MLFI
this may be it?
what engine is in that? the X model came with a few different ones. there was the K4.6, pink head silver crankcase, cutouts on head. (no longer circular), the F4.6 v1 either pink or grey head ("HPI" in two spots on top of cooling head.), black crankcase. or the F4.6 V2 grey head, black case...