Sliding Doors

1st question: I have this vinyl door and the frame is all bowed. It flexes easy it seems. The instructions say shim around the border but screws will only penetrate shims at the strike plate (per the instructions) the rest of the fasteners go through the nailing fin. Is this correct? Will I be able to get it straight like that? 2nd question: whoever put this deck on years ago seems to have done it different than normal. The ledger board is even with the door opening. Thus I am kind of between a step down and continuous type door. Should I make a step down sill pan of nice colored aluminum and then cut off the lower nailing fin? The ledger board prevents this from being a step down install. Here’s the instructions: [url]https://hw.menardc.com/main/items/media/JELDW004/Install_Instruct/VinylPatioDoorInstall.pdf[/url]

I don't know the manufacture of my door unit. It is all aluminum with a bronze finish and ea door is 4' wide (a 8' unit). It is about 25-30 years old and I had it installed back then. I need to find/get the vinyl/rubber strip that goes on the end of the screen door and that makes a seal between the end of the screen door and the glass. I have not been able to find a picture of this strip anywhere. I can post pictures of my doors and the piece req'd if anyone things they can help identify it or the strip required, Thanks in advance, Dave