Any 104/64 rings will fit -- in fact, for the previous generation, Shimano was supposedly using a common middle ring on the LX and XT.
It appears you're got the correct spindle length for a 47.5mm chainline (you're on your own on the shell width). The 'E-type' ES-series bottom brackets will all end in 'E' (BB-ES51E).
You're not going to find a ES70 or 71 in the required 121mm spindle length. However, you can go with a standard (non E-type) 118mm ES71, and the plate of the E-type bottom bracket or chainguide you're using will bump the spindle out to where the 121mm E-type would put it. This will have opposite effect on the non-drive crank arm, however -- it'll bring it inboard ~6mm from where the 121mm spindle would place it. Check that you have the necessary shell and chainstay clearance if you decide to experiment with this.
Ah, ok. I ordered a ES51 in 68x121E with the intention of using it as a backup on my Cannondale Prophet if I so choose.
Now lets say I want to use the BB on non E-Type frame.Will I just have to use a little spacer to get the correct chainline? Or will the non-drive-side crank arm just be moved outwards?
Yep, what speeddub.nate says. I'm "lucky" enough to have a set of these odd cranks, also. Just installed them on on the 04 Hollowpoint build that I'm into currently, ES51/68/121 for a 47.5 chainline.
I just found this thread while searching, and will throw in another option.
You can also use the Deore level Octalink BB ES30 68x121 to get a 47.5 chainline.
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