Turbo (KKK) and exhaust nut questions: 83 300TD?

[jdgrand]

I have the intake/exhaust manifold off to check turbo and replace leaking gaskets.

A couple of questions:

1) I need to replace the wastegate hose but the Mercedes wastegate hose (part number 000 098 07 83) is listed as being 9+ inches while mine is 12+ inches. I assume this part number is specific to the Garrett Turbo so it will be too short for the KKK. What's on there appears to be regular rubber washer/vacuum hose. Can I safely do the same again?

2) Are the exhaust nuts self locking and so do I need to replace them when reinstalling? The current nuts appear to be in OK shape but FSM says replace them.

Thanks for your help!