During my monthly engine inspection I found the exhaust down pipe had separated from the turbo on my 1997 Cummins 8.3. Closer inspection revealed the flange clamp bolt had broken. I am looking for a good part number and a source to purchase a replacement. It looks to be 3.5" in diameter. Not really sure why the bolt broke could have been over torqued by previous maintenance.
Check the brand and part number on your turbo and then contact the closest shop that overhauls turbos. Call a diesel shop if necessary to locate a turbo facility. Could also do it all online but nice to be able to make a side by side comparison at the parts counter. Could do a NAPA bolt replacement but it might be a specially item for high heat.
Pierce
The simple would be take your Cummins engine # to Cummins, they have the correct clamp,
Like Dave M said go to Cummins, if you don't have your engine # tell them you have a Holset HX40.