04 400ex Rear Brake Help!

So I bought an 04 400ex at the beginning of the year its a nice quad but it didn’t come with any rear brakes. It just had the rotor and the caliper stay. I have been having a hard time trying to get a caliper on, I ordered one and it seems to not fit then took it to the honda shop and they were saying my caliper stay was different so I ordered one and got it today and it was the same exact stay I already have. Its getting very frustrating. I feel like I either have the wrong caliper or I am missing another part. Any advice?? Here are some pics:

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