You have to build your own. Use the search function and you'll find numerous threads about an OD swap. some have pics.
if you dont have the plate that bolts to the bottom of the trans (triangle shape) you need to get it thru a dealer, then buy a mount and go from there...
just had to make one for the 46 dodge
I read somewhere that a trans mount from a GM van works. It's barely 1 inch tall which helps get the correct drive shaft alignment without hanging too low.
And Bill, If you decide to sell that Dakota , give me a shout.
i started with a gm universal mount out of a 2wd car mid 80's.use the first 2 mount holes towards the front and box your cross member to fit.
Right now i have the cheep universal mount from auto parts store for mock up,less than 10 bucks usually.