Something that hasn't been mentioned in here yet, 1981 model most likely did not have the black/grey fusible link box as has been shown in a few of these pics. I have a 1981 wagon and the original loom did not have it, the fusible links were literally two pieces of cloth covered wire coming directly from the battery + terminal. My 1984 ute has/had the fuse link box, I'm not sure when they brought it in. Before you ask, there's no point in me posting a pic of the wiring in my wagon since I've completely re-wired it.
I've got a March 1981 factory service manual in my possession, I'll look through it to see if there is any helpful diagrams for OldieSubie. A question from me; what does the fuse box under your dash look like? Does it have blade fuses or glass tube fuses?