You need the bellhousing from a Dodge Dakota, 1998-2002, 4-cylinder 2.5L manual transmission. That will get you a GM 60* V6 bolt pattern, AKA the "small metric" pattern.
I have one installed in my S10 Pickup with 3.4L V6, which uses that bolt pattern.
Sorry, I misread your post. There are no bellhousings other than the Mallet Performance LS2 bellhousing that will mate a 4.3L V6 to the AR5/Aisin large pattern transmission family.