Valve guide advice please
 

I'm putting an order in to our host.
Live in Australia and shipping is out of this world.
67 S 911. Std heads.
What should I be ordering for a set of valve Guides.
In a perfect world I presume wait till it's apart.
I see over sized and different brands.
Your best guess would be great.
Shipping is worth more than the parts so I'm happy to a punt and combine shipping.
Thanks lyndon

I would disassemble and inspect everything first before I started ordering parts

Is std in most cases I think .. unusual for heads to go oversize but I guess after a few replacements ..

I would discuss this with the person doing the valve job.