Spindle Nut Washer - 1985 C30 HELP :)

[Android04]

Afternoon everyone, looking for a little help with a part number.

I picked up another 1985 C30 2wd, that has drop spindles on the front. I just replaced the rotors and realized the key way washers are MIA. I've done some searching online and most part stores recommend:

Dorman: 618-007
or
Dorman: 618-012

I've purchased both and they are both 7/8" ID but will not fit over the spindle. I've search LMC, Classic Truck sites, Haynes book, and etc. and can't find the part number or what true size I need. Trying to get this truck ready for SETN, hopefully will see some of you guys there.

Any help would be great!