Here is a Dana rear end in a standard width, molded in white resin.
Overall length between axle tube ends is 2.25"
The width can be shortened to suit your build by cutting the axle tubes.
A Dana rear with the brake kit is available here.
See also a matching 4-link set for this Dana rear end.
Narrowed version of this Dana rear is found here.
Photos of a real Dana rear end.
Resin parts, 1/25 scale, by Futurattraction