Call me crazy, but I'd rebuild them. M is right about most conventional turbo seals- they are 'hydrostatic' due to the shaft speeds on turbos & conventional seals would be cooked. I take it you're going to a bigger drain line that doesn't try to feed the pan 'against' the windage...correct? It should also be higher than any possible oil level.
What bolts broke off? Turbine housing, exhaust flange, etc??? Maybe somebody cooked the housings once before.
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