does any body know where you could get these from or if any off another bike would fit and how much they are likely to be ??

Rare as hens teeth matey.
You need a different set of carb / engine rubbers too and I think Yamaha stopped making them.
Second hand ... I saw one set come up but can't remember how much they were ... maybe £250-300
You can get them new of course ..... again more than not cheap.

Once you get the parts you still need to set them up and flats can be a bit hit or miss.

A mate of mine modded a set of YZF750SP flatslides for his FZR600. But they did require extensive moddin, and he spent AGES setting them up.

ok then thanks peeps ill just make the std. 1s as good as i can get em an may be pick flat slides up cheap off a mug that not got a clue lol.

If you find said 'mug' can you get his number for me?

and me ...