"Long" Feeler gauges

[the real Takbok]

I'm coming up to my 60k km service and I'm thinking of doing it myself.

Does anyone know where i can get "long" feeler gauges that I've seen mentioned elsewhere?

Thanks.

 

[ClimbingTurtle]

 

[the real Takbok]

 

[Welsh]

 

[the real Takbok]

 

[tok-tokkie]

 

[Rigalo]