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I used an Escalade/Yukon 6.0L/6.2L starter. It bolted right on (with an additional longer bolt) and works great. It's listed as 1.7kW like the original LS1 starter; 5.3L truck starters are only 1.3-1.4kW. Here are the part numbers I have for it:
12588052
89017844
6757
I used Dorman #72181 for the second long starter bolt, which is $2.99 and available in most local parts stores.
You can get a Delco Remy (GM) one from AutoZone new or remanufactured. I highly recommend you get the style with 2 long bolts since it can prevent breaking the block mounting if you have hydro lock or get a severe backfire while cranking. I did a Thread on this a couple of months ago.
Not at home but I can get a couple of part numbers for you when I get home. They are about $200. You can get good starters for less but just get a 2 long bolt design.
Designer Imagines A Corvette That Looks More Like a Corvette Than the Corvette
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