Went to do a service on my DT125RE and when going to replace air filter the Airbox holder guide foam material is all falling apart

https://ibb.co/MyQXNL8w
https://ibb.co/84PwwMgf
https://ibb.co/yFJsF8Vs

Having a look online fowlers want £55!

Part number 3BN-14459-00

Has anyone ran without the foam on that part and just relied on the actual air box filter?

Or Should I just remove any loose bits and keep using it or is it really worth replacing ?
Many thanks