You can purchase the Six Star SOHC Head Gasket Kit here.
https://awdautoparts.com/product/subaru-six-star-turbo-head-gasket-set/
You can learn about the MLS Gasket here.
If you wish to purchase only the 6 Star Head Gaskets for the Subaru SOHC 2.5l only you can do so here.
If you dont have one of these models please use the request a quote form instead.