Short circuit and open circuit stubs

[3bweh]

I am designing an amplifier
and i have short circuit stubs with different Zo (non of them is 50) and different electrical lenght
and i need to conert them to open circuit stubs
how can i do that?
adding 90 degrees to them doesnt seem to be right

any suggestions?
thanx

 

[vfone]

**broken link removed**