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David is very knowledgeable when it comes to the early 150's. I actually had my right wing in his jig when I rebuilt it. During the overhaul, I upgraded to the long range tanks.

I feel that Peter Benway is somewhat correct with his statement, you do need to move a rib and install new flap bell-crank brackets bulkheads. You will also need need new fuel tank covers and to reskin the inboard upper wing skin. Where his opinion and mine differ is that I feel that since long range tanks were a factory option, you can modify the wings per the original factory installation to install the tanks. Using factory parts and drawings, you are simply installing a factory option and not making a major modification to the airframe. Going this route, you just need an IA to sign the 337 covering the modification. There is no need to get the modification approved by the FAA since it was a factory option.

If you can find a set of damaged 175 wings, they should have all the parts that you will need to convert your wings. I will have to check, but I am pretty sure I have the rib, bulkheads, and the flap bell-crank brackets to modify a left wing that are in excess of my needs. If you decide to go with this route, I would be willing to part with them.

If you look at the picture, the lighter green parts where I have my hand are the parts that you need for the long range tanks. If you look closely, you can also see that I added a leading edge landing light to my right wing.



I hope this helps