I'm helping a good friend start planning/gathering parts for a turbo build and trying to find out what timing cover works to switch to. I found 2 4v covers at my work, both are slightly different. One is part number f5le-6d080-ab and one is 2c5e-6d080-da. google's no help trying to figure it out. Does it matter what 4v cover is used? Anyone who's got some help/pics would be greatly appreciated!