Originally Posted by azcagiva
If it was my bike I would modify the cover before I would drill the filter and risk getting metal shavings in the engine. Some could get caught in the folds of the filter and come out later.
If you cut the protrusion down to match the other you should be fine.
+1 to this, but I think in addition to cutting the cover protrusion down to exactly match the stock piece (so that it holds the filter inward) you'd want to notch the protrusion so that some oil pressure could get into the pressure reading tube.