As far as i'm aware theres no difinative guide to knowing weather or not you have ESP, theres nothing you can look at and say "oh yes!" if you know what I mean. I think tech2 can tell you but thats about it. Otherwise, theres the more dangerous aproach, put it sideways and see what happens! lol. If you have ESP its flippin amazing, its like the hand of god comes down picks your car up and points you back in the right direction like nothing ever went wrong. I relly on it a little two much and one of these days the fuse will blow as i'm mid slide! lol.
As for the gray panal. ill have to do some more digging around for the part number but its a bitch to get. Many people just kept getting sent the wrong one, I ended up with a black one and then got a special paint mixed to colour code it. Still got some somewhere! was thinking of doing my side vents at some point.