i have the giro 540 helmet and from what i've heard, these are not compatible. does anyone know if there are tune ups for this helmet? or do these actually fit?

Tech Specs:

Material:

Nylon, plastic 

Input Connection:

3.5mm Plug 

Cord Length:

Not Specified 

Weight:

Not Specified 

Compatibility:

Giro Omen, Fuse, G10/G10 MX. Nin.9 Bad Lieutenant, and Encore helmet models. 

Recommended Use:

Skiing, snowboarding 

Manufacturer Warranty:

1 Year 

Country of Origin:

China