Why don't you cut slots in the parcel shelf and fold the metal under so the 6x9's fit.
That way you're not technically removing any metal, and it can easily be folded back and re-welded if any authorities did complain.
Saves using those horrible pods.
The pods i have in my eb xr6 are identical to the pic Fhrx posted above, i got them from Doran Pro Audio Canterbury Rd Bankstown for $120 the Pair
They only just get under the rear windcreen (on an angle tho) with Kenwood 7 x 10's in them