front fork tools

i want to do a service on my front forks any one know where to buy the damper rod holder part number out the manual 9090-01454

Try your local Yamaha motorcycle dealer.
I wouldn't expect them to have it on the shelf, but Yamaha dealers here in the USA can order the special tools shown in the Service Manual from the special tool supplier to Yamaha dealers in this country.
I hope it's the same where ever you are.

If that gets you nowhere, a retailer that specializes in dirt bike suspension parts and service, like Race Tech.