The part number may depend on the donor vehicle - different intercoolers (eg front vs side mount) could have a different pipe. Maybe. But try these part numbers:
17345-46010 or
17345-88400
might be a start.
That being said, price-wise, you are probably better off with an aftermarket silicone elbow, a couple of straight joiners and a couple of lengths of [insert metal of choice here] pipe.
I am pretty sure they do reducing elbows in silicone too, but I doubt you'll find one at your local exhaust shop
Or post in parts wanted for someone that has put custom piping on their 1JZ and has their old stuff lying about somewhere.