Hey Steve,
Mate, mine are still in their packet!!!!! they wont fit, and are not close to original, I think like mentioned above they will have to be glued in, PITA, wish they fit better, I never got any further info as far as cross section per above sorry.
cant add much more than that at this point, its something that needs to be drilled down to get the correct info for sure, I just have not had the time to do so, pitty the early ones fit!!!