Changing engine oil cooler lines on a friend's 2019 silverado lt, purchased gm genuine lines however there's a block off plug in both ports on the cooler "block" I feel like there should be threads underneath the block off plug but don't wanna ruin the assembly. Has to be done today. Anyone ran into this? Ordered the lines for the correct model just not sure I wanna risk it. The factory lines has what I would assume is the oil pressure sensor on the first port. Pic is not mine but same situation...