Thanks BPratt.
I am going to swap in a E300 cook box and lid and drip tray into the Spirit 2 stand.  The drip tray will hang a bit low for  the lower slats, but that is just going to have  to be OK.  I found that the Spirit 2 cook box also has to mounting bolts in the front outer edges as well, but I already tapped in threads for the bolts into the cook box.  I will probably put a SS 7/16 bolt on the back side as well.  Otherwise, I think it is going to work out OK.
Here is the cook box from the Spirit II that I am  trying to replace.
View attachment 91068
View attachment 91069