went with this one (it was in stock):

MPE-94105

Inlet Quantity: Single
Inlet Diameter (in): 2.250 in.
Converter Inlet Attachment: Slip fit
Outlet Quantity: Single
Outlet Diameter (in): 2.250 in.
Converter Outlet Attachment: Slip fit
AIR Tube: No
Converter Case Material: Stainless steel
Converter Substrate Material: Ceramic honeycomb
Heat Shield: Yes
Converter Overall Length (in): 13.000 in.
Converter Overall Thickness (in): 4.000 in.
Converter Overall Width (in): 6.500 in.
Converter Style: 3-way
Gross Vehicle Weight (lbs): 6,000 lbs.
Quantity: Sold individually.
Notes: This is an oval converter.

Catalytic Converter, Stainless Steel, Universal, 2 1/4 in. Inlet/Outlet, 13 in. Length, Each