Mike, TiAL makes these adaptors... they are about $60 and are in Stainless Steel. Contact Mike at Road & Race Engineeering. He supplied mine. If he can't supply anymore, I'll sell you mine which is new in box still for USD$60 + shipping.
As for the discharge adapter, I researched this too, and it seems it'd have to be a custom piece made up
'89 911 Turbo Cab
Protomotive MAP ECU, Twin Plugged Heads, GT2-EVO CAMs, 3.3L fully finned P&C's, ARP fasteners, C2T head gaskets, Titanium Retainers, Turbo spec valves, springs & guides, 964 splash valves, GT35R BB turbo, GSF Stainless Headers, Magnaflow Exhaust, Full bay Intercooler, TiAL 46mm w/gate, TiAL 50mm BOV, Apexi AVC-R EBC, SPEC Stage3+ Clutch kit, Crane CDI Ignition