There is no need for any spacer, anywhere. The L92 crank is no different than the older LS1 crank in terms of the way that the pilot bearings are positioned. Keep in mind that there isn't a manual transmission option that was ever offered in a SUV.
There are two styles of pilot bearing, the f-body style, which sits deep inside the crank and has a relatively small OD, and the LS7 (maybe Corvette in general) style pilot, which sits further back on the crank (where the torque converter used to be) and has a much larger OD.
If you are using a F-body T56 with a stock bellhousing, then all you need is the f-body style pilot bearing and a stock slave assembly, which will work with the LS7 style clutch.
Also keep in mind that using spacers between the transmission and the bellhousing is not recommended, unless it is machined perfectly and has alignment dowels incorporated in the design. Not having the dowels can potentially throw off the input shaft to crank alignment which will cause poor shifting, increased wear, and clutch release problems.
Andrew
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