86 SWB Fleetside Bed Differences

[11555wally]

I ordered a repair panel for the back drivers side of my bed and it didn't match up to my bed. As shown in the picture the first raised rib is wide like all of the other ribs except the next one to the right. The spacing is different as well between the 1st and the 2nd. Does anyone else have one like mine? If not, do you have any idea how I happened to get this one. It appears to be original. Just curious. Thanks for any input.