are you looking for the metal brackets or just the replacement rubber element ?
if you need the metal bracket those are around i might know of some ...they are way different than B-bodys ......if the engine is in the truck not likely you need this part
if you just need the replacement rubber part of the mount ....auto zone part number 2469 or any parts store like that can get you replacements
http://www.autozone.com/autozone/parts/1990-Dodge-Ramcharger-4WD/Motor-Mount/_/N-ign31Z8ii2i?filterByKeyWord=motor+mounts&fromString=search
