Since a certain parts vendor is out of stock of the Universal Kit and I do not want to pay the additional $20 for the HK45 kit (I have an HK45). I searched and found a vendor that is selling LEM kits marketed as fitting all USP and USP compact models, but did not specify that it would for the HK45. I am assuming it wud probably work as I am wanting to install the LEM light trigger and do not need the trigger or hammer springs in these kits. Opinions? Was there an USP Kit made before that would not fit the HK45?