The new jib cars / travelers are a different (more recent) upgrade than the integrated crossbar. I'm pretty sure the crossbars are interchangable with the old style.

Depending on how accurate your math is with your estimate of 10-12 years since you've been around...

There was a fairly major set of changes circa 1996. This involved:

Integrated travelers (instead of raised, riveted track), both front and rear crossbars were redesigned. The front was redesigned to incorporate cheek blocks for remote/shock-cord traveler adjustment.

Improved design of pylons (no more mast section with sail track).

One-piece rudder gudgeons.

Hobie 20 Miracle style tiller connectors.

Aussie jib halyard became standard.

More recently, 6:1 downhaul became class legal, as well as an adjustable jib halyard setup.

Of these, I think the biggest performance improvements were the rudder gudgeons and tiller connectors. Everything else primarily improved durability, ease of use, etc.

Mike