RKS has LEM v4.1 kits in stock for $85:
If it is like their regular kits, you should expect the necessary HK parts "carefully" packed in a lousy sandwich bag. No ham or cheese included.
Also even in pre-crown apocalypse days, they would always take several weeks of meticulously thinking about your order before shipping.
However, oh, well, they have ALL parts, not just those on top of regular LEM in stock and at a relatively low price.
Unfortunately, I have the regular GG SRS in all my P30s/P2000s, and I got the spurred hammers waiting to be installed.
Or perhaps, fortunately, otherwise I would have been forced to spend an obscene amount of money.