The adaptor Wally World and Crutchfield have is for 1986 up Toyotas. and they are the same at both stores. There must have been a change in the color codes. Try checking the 85 FSM at
North Carolina Toyota Territory Off-Roaders Association
The brackets you need are on eBay used. One set right now is only $17. Try searching eBay for "4Runner radio bracket." I get a lot of stuff from eBay and it usually arrives 2-3 days after I pay for it.
I just did a new radio in my 00 4Runner last week and noticed the wire adaptor was not for 85 and older Toyotas.
I also bought 4 nuts I needed from Toyota last week and it was over $12 for them and they took two days to arrive at the dealer. I can't imagine what they charge for the radio bracket.
FWIW the Radio Shack nearest to me no longer sells stuff for automotive sound. They are all about selling TV's and cell phones. I was looking online for an antenna for my 1st gen and they had one "online only."