[s-cars] any other new parts sources besides Blau, ECS and the dealer?

[forrest bradshaw]

looking for heater core with 20mm hose inlets.  every core I find and the one my tech got are about 18mm.  car has been down for a week now, I'm going through boost withdrawls.
 
any ideas how I can make this work?  too afraid to clamp the hoses down tight for fear it'll leak again.
thanks

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