47-55.1 Lower Radiator Splash Shield

[51 3600]

I'm working on mounting the grill and lower radiator splash shield on my 51 3600. I can see where the splash shield mounts to the fronts of the inner fenders but I don't see where the 2 tabs at the back of the splash shield mount. Looks like they should go between the inner fenders and the core support but there aren't any holes that match up with the ones on the tabs and there are no recesses in the inner fenders or the core support to accept the tabs. Without recesses the tabs would cause a gap between the inner fender and core when shield is mounted.
What am I missing.