Anyone recognise these?

Hi all,
Just bolted the Z1r motor back in yesterday and found these brackets in the bag of engine mount stuff but don't remember them and can't see a place where they might belong.

Does anyone recognise them or have I got some things mixed up along this journey?
Thanks,
Ian.

It's a not a stock part that I can recognize Ian...unless it has something to do with the OEM muffler.

Thanks Dave. Looking at the parts list I can't see anything similar including the muffler fittings. Which I won't be using anyway! I will keep in a safe spot in case there is a future revelation!

never seen anything like those mounts used on any Zed motor?

There for the optional Super charger

......There for the optional Super charger .......

if only - heh have you seen any of the photos of the ZR900S yet ???? mmm tasty