Have some overflow questions.

Here's the problem boys, I have my sump built with the baffles and what have you. I have also gotten my tank drilled in the back about 3" over and 2 1/2" down. Now obviously I know how too rig it all up but I cant figure out what pieces too use, how too seal it ,and make it flush like the store bought tanks. do I just use pvc pipe and silicone around it?

I'd like too do the best job possible thanks. :-/

 

So somthing like this? Pentair Aquatics 1 1/2

Sorry, I'm as sick as the day is long and im having trouble thinking clearly.

So no sealent just the rubber gasket?

 

Should have drilled it 2.5 up from the bottom and then you need a internal corner or 3 sided overflow column or box. that is simply siliconed into place I Use a L shaped 2 sided overflow for all my builds never liked the 3 sided boxes unless it was a huge tank.

 

I have a spare tank that I could use instead! but 2 questions

1) Where do I purchase an overflow column

And 2) Can I get a perfecto tank drilled?

Thanks for the help