Maybe one of these similar products would be of interest:-

Shoei Adult's RF-SR Helmet Thicker Center Pad Top Black L13 - 0207-4206-13

GMAX MX-46Y Youth Helmet Top Inner Liner Pad Black

GMAX FF-49/GM-39Y Top Front Vents Kit w/Screws Black

GMAX G064049 Top Rear Vent Matte Black FF-88/GM-64

GMAX G077005 TOP FRONT VENTS LEFT/RIGHT MATTE BLACK OF-77 Top Front 72-3776