I went through a couple of Lister manuals that I have. I do not have one for an SL but have LT/LV, ST, TS/TL, and HR manuals and they all read the same. They all call for a wear limit of .003-.0035" and a max clearance of .005-.006". I cannot imagine that the SL would deviate much from those specifications as they are in the same ballpark as most engine recommendations.
I am not sure where you are located Scott, but one thing to consider is British vs American engineering practices. The Brits tend to spec a nominal size, say 2.5" for a journal diameter and then remove the needed clearanace from the journal diameter. They would spec a 2.5" bearing ID and a journal diameter of 2.498" whereas American engineers tend to do the opposite by specifying a 2.5" journal diameter and a bearing ID of 2.502". If you are in the US that may be something to consider. I will keep looking around for an SL manual but hopefully that helps.