Stephen, I am currently working with Mike at Bent and Twisted on a 91 K5 build up. (you probably saw the LARGE order recently) During the brace install, it was noticed that the oil cooler lines are in the way of bolting the bracket to the frame. Mike said he thinks he can put 1" spacers under the bracket and re-drill the crossmember. Please let us know if you have any concerns over this mod. To the best of my knowledge, the oil cooler is stock (hmmmm, I think I remeber seeing that option in the codes also). Have you ever run into this problem? Thanks, Dave If You Drink Don't Park, Accidents Cause People. 91 K5 - in the process of 4" lift with D60/14FF plus LOTS of extras. ETF August 1.