Where to get oversize 20v shims?

[PazzaAE86]

As per title, Toyota's shims arent big enough to get 3 of my valves to spec. I need 2x 2.40mm and 1x 2.50mm.

The problem is, 20v 4AGE runs 5mm valve stem tops, most engines (16v included run 6mm) and i cant find any shim providers who do 5mm internal diameter. Ive heard Motorbike's mentioned but they just seem to be flat shims that sit on the valve rather than over it.

Any help?

[Project D]

If you can't find any "cheaper" solution:

http://www.arrowprecision.co.uk/shims.html

[PazzaAE86]

Arrows only do 5.5mm smallest valve stem diameter. 0.5mm im told is too much slack and could cause problems.

[Project D]

Do you know the outside size of the shim ?
(maybe I found what kind of motorcycle's engine who can do the trick )
If you can take a picture also, to see how they look.

Also, for custom parts:
http://www.kelford.co.nz/lash-caps-and-spring-locators/