here are some photos of the 2nd hand oil pump.
i had no issues with it on my car. seemed to be running fine, but as you can see from the photos it was fitted to my car without a crank collar. and a mild witness mark from where it was rubbing on my crank. it is still a bit oily and has the remains of the old gaskit that has been half pulled off.
my car has done 128,xxx kms. but has been replaced some where in its life. before coming to australia. i would guess it was done when the timing belt and water pump was done. the sticker on my engine said that was done at 92,433kms.