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Spindle? Bushing? I know there's a knuckle between the upper & lower control arms, and there's a wheel bearing on the outside of each knuckle. Which part do you want? As for the knuckles, the diagonal knuckles are the same, just flipped around, so there's just two part #'s for the knuckles.
You can find any part number you want in a free PDF parts catalog in the C5 Downloads section of Crossedflags.com.
Great idea with posting a pic, that nails it right down. This totally sucks because you CANNOT get those ball joints by themselves. I've been looking and looking and looking, and even asking, but so far the only answer I get is that they only come as part of the control arms. I've been wanting to replace the ball joints with a premium ball joint. The control arms are about $150 brand new and come with the ball joint built it. What I suggest doing is looking here: http://forums.corvetteforum.com/showthread.php?t=973345
You'll see that Phoenix Performance is selling control arms for $45. Go order yourself one now. Phoenix has a great rep. I just bought springs from them last week. Call them and leave a message to let them know you want a control arm. Good luck breaking the ball joint loose. I felt uncomfortable with the amount of force I had to use with a fork, so I bought the special GM/Kent-Moore tool. Hopefully you don't have to blow your money on that too.
This is very frustrating because chevy's service manual SHOWS how to service those ball joints... In the middle of trying to find a replacement right now, and it is very frustrating trying to sort this out... I need a rear upper balljoint...