What is the plural of "Mini Cooper S" ?

What is the plural of "Mini Cooper S" ?
"Mini Cooper Ss" "Mini Cooper S's" "Mini Cooper Ses"
"Mini Cooper S-es" "Mini Cooper S' "
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What is the plural of "Mini Cooper S" ?
"Mini Cooper Ss" "Mini Cooper S's" "Mini Cooper Ses" "Mini Cooper S-es" "Mini Cooper S' "
I need to know for my website!
Ship Shiperton Henethe
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload

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