Aftermarket oil pump pickup height issues

Engine is a 340. Engine manual states pickup intake should rest on bottom of oil pan. Have purchased two pickups from Melling both of which will are too tall. One inhibits oil pan from contacting pan rails by 1/2 inch. The other 1/4 inch too tall. I should mention the oil pan is a Milidon stock replacement. Purchased Milidon pickup which is not tall enough by 1/4 inch per their specs. Pickup screen at least 1/2 inch from bottom of pan. Anyone have these same issues with these aftermarket suppliers and if so what did you do about it. Milidon has requested I return my pickup to verify it's only 6 1/2 inches high and not the spec 6 3/4. Was was going to let it go based on Milidon's comments but changed my mind. Did not think it right.

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