Hi,
FYI, I had a p20 and p35 and didint really liked them. It's not the best design if you plan to change regularly the drop in, and even with the oveready drop-in, there was some play at the front bezel if you pushed on the glass. The O-ring are also easily misplaced.
The actual host or the old mooddolar/p60 interface are much better.
My two cents.