Keo cleat rubber inserts, available separately ?

[Ridgeway]

Some how i've ended up with several pairs of the standard Keo cleats and i much prefer the Keo Grip cleat ie with the rubber inserts underneath. I know many don't like them due to clipping in issues but some how they work for me and i'm happy to avoid any slippage risks when ever i can. I noticed that on the standard cleats there are the small holes in the moulding so the rubber inserts could be added later on, i suppose for standard manufacturing purposes and that makes sense. My question is if anyone knows if you can buy these rubber inserts separately ?

PS: i'm not referring to the rubber Keo cleat covers