Sorry to have to correct you David, a MAJORITY of Mk1 cars had the later 97 - 05 8mm Opti zip. A few early cars had a narrow (7mm) Opti zip, some had a similar YKK zip but most had the later zip.As Pete says, all standard roofs have the top zip and velcro sides. The only difference between mk1 and 2 is the zip quality. Meaning that you need both sides of the zip to swap between mk1 and 2.
Incidentally this change (mk1 to 2 zip ) happened well before the car change mk1 to 2.
I don't know what you have got?
Had to change the hood side of a 7mm Opti on Monday!
As for the zip which ran up the side, over the top and down the other side: Aftermarket hood of unknown manufacturer, have replaced several of them, but have disposed of them so cannot offer the OP a solution other than a complete hood replacement?