How to convert Nat gas to LP Gas (kit)

My Father in law had this brand new cooktop sitting in his basement which matches our new kitchen. Its a 1994 unit. I know they say sometimes the kit is inside the body of the cooktop. How do i get inside the body.

I’m in search of a conversion kit "NLPKIT2" which is manual but everyone says its no longer available.

If someone has a repair manual or remembers how to take these apart and convert to LP gas would be a great help.

Thanks
RalphtheMouth