Mr. conradnash
Please your kind attention:
Here are two spades (I call them also cable shoes: an 8 AWG and a 1/0 AWG. I laid them on a $50 bill, for you to have true size and proportions. Both are quite a tight fit to the wires, to ensure best contact when crimped.
https://imgur.com/a/wueD1lq
https://imgur.com/a/RxDhvjz
A 2/0 AWG is thicker than a 1/0 AWG. Never used a 2/0 AWG, but the gauge table: https://www.powerstream.com/Wire_Size.htm Say that a 1/0 AWG has a 8.25246 mm in diameter, and a 2/0 AWG has a 9.26592 mm in diameter. It’s 10% or 1mm thicker wire.
I do not see a way that the flat side of that spade, even if you cut its front center out, is getting into a standard binding post.
I only try to save you some disappointment, when you get to the "bridge" and want to cross it.
I also would like to remind you, that the weight of a 2/0 AWG pulling down this spade from a binding post, is not the match I would like to see.
Some guys here, have equipment accesses of $1/4M! I would not dear to risk in that way. Please use extra caution.