T4 .83 housings are readily available.
We have more than 100pcs in stock. Part Numbers are on our website. We have many already machined for hx40 outlet. Option to machine for the 73.4mm wheel is available.
Divided Scroll .83AR T4 for 68mm wheel profile:
178313 for short
179069 for extended
179066 for gated (one port)
Open Scroll
177210 for short
The .83 divided for the 73.4mm wheel with dual wastegate ports is
13801009034