[prktkljokr]

Probably already sorted but Check your PDS, pretty sure most have a mention about the claim settling process and timeframe.

Hit the insurer up, tell them you feel the vehicle is unsafe to drive, seeing it cant be fixed in a sufficient time frame because of said part on backorder with no ETA, a Hire car of the same size and towing ability is required until the backordered part arrives and can be fitted.

Or if they are willing to fit a good second hand unit until the new one arrives and can be fitted so you can continue to drive without too much more inconvenience.