The cover is made of 10 guage steel.. Same as deck thickness...

This only fits 52" icd decks ferris.. Snapper pro

And simplicity .. 

Ferris 52" Is700z. Isx800 is2100z isx2200 

Ferris is600z 52" non icd

Snapper pro 52" s125xt 

Simplicity 52" citation xt 

It does fit some is500z is2000z is1500z but we would need to see a pic of deck to verify...