Does the front of the top 'snap' to the top of the windshield? If not, you have a 'bimini' style top. The original cockpit cover was probably replaced by it. Are the panels you have clear plastic? These would normally go on the sides (zipped as you stated). I've never heard or seen 'adapter' pieces between the sides and top.
Hope this helps.
95 Max 2300SC
Nine Mile Falls, Washington
"If you look like your passport photo, you probably need the trip"