I have a Seamaster Electronic F300Hz with Steel case (ref 198.0042 - 398.0822) which used to be my fathers'. The watch used to have the original Corfam wristband in blue and clasp no.27. My father had several times reordered new wristbands at the time. I know that this original wristband is not available anymore as the Corfam material is not strong enough for the purpose. Would anyone be able to help me find a good alternative (I am specifically looking for a wristband type with a clasp so I can use the clasp I already have. The good thing about this wristband is that is quite chunky/voluminous, as is the watch. As I have a big wrist, this is desired to create a the perfect look.
On some of the pictures added, the wristband I am looking for is attached to a different watch than mine, it just shows as an example

 

Hello
I think eBay is your best bet. It might take many months but you will be surprised what pops up on there. Reaching out on every watch forum you can think of is another option or try and get one custom made from a strap maker.