OEM Blue rubber with deployment clasp ?

This is an older website that has been maintained and has exactly the info you want:

https://www.chronocentric.com/omega/bands.shtml

Not sure if all those straps are still available, though. The flat and double-ridged ones are solid rubber and quite sturdy. The last one shown (the domed rubber strap) is really rubber over a leather core. I had one back in the day and it came apart in less than two years. I would not recommend it.

I believe modern rubber straps will fit. Search around this forum and you can probably get more info on that.