RE: Perkins T6-354 Turbocharger
As an FYI, you can use a turbocharger from a Dodge/Cummins truck to replace yours.
You have a Holset model 3LD I assume? (or a Schwitzer, same turbo).
You can buy a Holset H1C really cheap on ebay. Those were stock on 89 thru 94 dodge pickups and owners upgrade and sell the OEMs cheap. A rebuilt kit is approx $80 if it needs rebuilding but it probably won't.
It will bolt right up to the adapter that is off your exhuast manifold. You may need to buy an adapter hose or two to make it mate up on the air side dpending on the compressor outlet you find.
Any of the H1C models will work and will actually be a slight upgrade from what you have.
Just a thought if you can't find the part you need.