What year did the fuse block pins get smaller? Chevy

[HAFROD]

I remember swapping a complete 87 wiring harness with dash into 79 El Camino I had years ago. I remember the pins in the main fuse block were smaller so I ended up having to change out the engine compartment harness too. This is the two piece main fuse block that separates at firewall with a 10mm headed bolt in the middle. The reason I ask is, I have an 85 and 86 Monte SS here. The 85 has some butchered wiring so I was thinking of swapping it from the 86 parts car. What year did they swap that over?

 

[pontiacgp]

In my 86 GP the bolt in the center of the two harnesses at the back of the fuse box is an 8 mm. I replaced one harness with one from an 84 Cutlass so I think you're ok with an 85 and 86

 

[L67ss]

Yeah I'm pretty sure my 86 cutlass has large fuses

 

[HAFROD]

Yeah I'm pretty sure my 86 cutlass has large fuses

Not fuses, it's the spade connectors when you split the fuse junction block

 

[mikester]

Theyre called Packard connectors and as far as I know they are mixed sizes in one bulkhead connector. Thats the way my 81 Malibu was set up. Heavier wire has a wider spade. You can order them from this place. I bought a bunch of different sizes when I was cleaning up my harness under the hood. I didnt want splices so I ran new wires from the block out. If you spend the money and buy an assortment you can buy the right crimper from a place called Tool Aid. Its a ratcheting crimper that makes them look like factory. I just got a crimper off of ebay for round $70 with a bunch of dies.
http://www.texasindustrialelectric.com/_packard_terminals.asp