Ok,
When you say seized, do you mean the bolts or the valve?
Mine's a 2001 Fazer with 45,000 miles. What year and how many miles has yours done?
I'm looking for parts 4, 9 (x2) and 13 in the attached jpg.
If you get it apart, would you be happy with £50 plus p+p for the bits?
Cheers
Chris