my 85 has an owners manual for the 84 model year judging by the radio, and transfer case sections. not sure if it was stock or not. the engine is also date codded as an 84. My 87 Comanche also has the metric threads, and uses the same filter as the 258 did in 1990. I'm wondering if the changed connectors for the radio in 85, as mine is different from what I've seen 86-87 jeeps equipped with, but it is a DIN style radio.