Rear Main Question

Good Morning All
In the past 50+ years I have owned more /6's than I can remember. Sold my last one ('64 Dart) about ten years ago.
Fast forward to today and I (we) are the proud owners of a '67 Dart GT ragtop.
The car shows 107K and appears to have been reasonably well cared for, which brings me to my question.
If memory serves me correctly, leaky rear main seals were a 'common' problem. This '67 is no different.
Have there been improvements made over the past decade, or do I order up a parts store Fel-Pro set?
As always, all suggestions are welcome.
Thanks for your time
'64 Dart