Mini Starters on a Slant Six
You can also find them on most Jeep Grand Cherokee's of the 1990's
Nope, that's a totally different starter with a totally different bolt pattern, not interchangeable.
and people say the V-6 Magnum starter interchanges, which you find often in 90's RAM vans.
There is no mystery about what fits and what doesn't, so no need to rely on what people are rumored to have been heard to think about saying. '88-'03 3.9 V6, 5.2 and 5.9 V8 in RWD/4WD Dodge trucks and vans. The units after about '93 are even smaller than the '88-'92 units.
Be sure and get a genuine starter with a Chrysler, Denso, or Nippondenso nameplate on it. The Chinese copycats flooding the market (advertised at parts stores as "100% new!") are junk. A used genuine starter from a wrecking yard is preferable to a new fake/Chinese or "remanufactured" starter.
If you need to rejigger the connections to get adequate clearance for your battery cables or other parts, that info is
here.
And if that starter doesn't get you enough clearance with your headers (or Hyper-Pak, or DDDs), then you can get even more clearance with slightly more work by using the '05-'07 Dodge Ram 5.7 V8/Manual-trans starter described and pictured (with video, even)
here and
here.