Weather Strip for Mondi Windows

I'm thinking of replacing the window weather strips on my Mondi 8 as they've partially detached themselves from the metal carriers & are 25yrs old.
Just found this website: http://www.sealsdirect.co.uk/bbCMS/shopping.asp?intDepartmentId=4

Q. Has anyone done this and can reccommend a good supplier?

Thanks,
Mike