There are Yoshimura Radiator & oil cooler core protector lineup for various models.
It is made of 0.8mm thin stainless steel with fine thread line, and it maximizes cooling effect while protecting radiator/oil cooler core.
[Webike Japan Product Page]
Radiator & Oil Cooler Core Protector
[Webike Japan Product Page]
Radiator & Oil Cooler Core Protector
[Webike Japan Product Page]
Radiator & Oil Cooler Core Protector
Original Source[ YOSHIMURA JAPAN FACEBOOK ]