@dagree from my understanding, which is limited, the poptops keep the new lids and the caravans go back to the old style.
That was the factory decision back in May with the first of the "new old lid full vans" handed over ...... but measuring in "Jayco decision time fudge factor", a month is an incredibly long time so many things could (and probably have) change back and forth upto 30 times (one change for each day of the month)
They designed and had manufactured some quiet nice Bed End Flies for the old lids (although they didn't quite fit properly, it was good attempt) ... then within a nano second they completely changed the lid design, but continued to sell the BEF that were designed for the completely different old lid. Then just when you thought it was safe to go back into the water, and order a van with a lovely BEF, they changed it again .... glad that was all over ... whoops, then when they thought maybe people were getting way to comfortable with the new new lid, they changed it again but this time backwards to an old design two designs old.
One would think the lid designer might yell out and say "Just for a laugh, Im gunna redesign the hardlids, don't worry Im not putting much thought into it, but is that going to bugger anything else up". The BEF designer could say "nic off, Ive just ordered a million BEF to fit the old lid which won't fit your stupid design".