May I recommend an alternative to replacing just the connector? Replace the whole cable and connector with something longer. I used a $4.00 8-pin serial cable I bought off eBay. Old Apple computers used this same connector. You can also buy something branded "PCE controller extension" but if it's not 1st party NEC it's likely just one of these serial cables people gouge on eBay with listing it as a rare controller extension.
You don't necessarily have to reuse the factory connector. I just hard wired mine in like this.
It still fits neatly inside the controller casing and does not interfere with D-pad function.
The finished product
This will require you checking wire colors of whatever cable you use because they won't be the same as factory. Also, you don't want to go too long as it will cause problems. The cable I bought was 6 feet and I cut it down to about 4 feet. This will, however, give you all the length you've ever desired.