Help to identify correct foam surrounds for the Mission 720 (late 1970's) 10in woffer

[bazza31]

Hi everyone its Bazza..
Im trying to refoam these old original mission 720 but I cannot find the correct or closest to 10in surrounds. I would like to get foam as to remain original.

 

[baeijsman]

https://www.ebay.com/itm/125629481308