I'm not sure how its supposed to be but I don't think this it it lol,there is a plate welded on top of another plate which is welded to what looks like the original arch.There is bare metal behind the plate and the welds I popped off with a screwdriver.
I took some pics for your viewing pleasure lol
The red line is one plate and the green is the other.
(Just uploading pics now)
Edited by flatline, 06 March 2013 - 01:43 PM.