I didn't even know this was an issue. Unless it's the issue with the button being super hard to push on the outside handle?
If so, the trick for me was not a new rod, but an old button/lever. Since the reproduced parts for the handles are either made for another vehicle, or just made wrong (either one is possible these days) they just don't have the same leverage factor. Swapping the old buttons into the new handles solved the issue for me.
Of course, if you have black handles, that won't work well.
Or is this another issue with the rod being the wrong size? Is the new rod the wrong length? Is it the same as the old one, or longer?
If I had to change the rod length a little bit and no replacement was forthcoming, I'd get one of those threaded hex bits from the home/hardware store, cut a section out of the rod and thread the two halves.
Put it all together with Locktite (even if using jam nuts) and make it any length you wanted.
Just how much shorter does it need to be? Are we talking 1/4" or less or thereabouts?
Paul