Kevin...the School Bus did have the vertical vane on the back vent. The one thing it did have in the Seattle race was the verts from the Pink Lady was the tapered Jones wings as they broke the Lucero wings with the flat trailing edge in TC when the rudder broke. Here's a screen grab of it from Seattle..
Here's another on the trailer...
Here's the PL from San Diego
Also if you look carefully at the two boats...the cowl on the PL sits back farther from the cockpit than the SB. It is also slightly shorter in length over all. The airscoop on the SB sits right up on the back of the windshield on the SB because the nose it longer than the PL. Plus the back edge of the windshield slopes are opposite from one boat to the other.
Shann...the odd sized verts didn't run on the PL until 1990. Also there are small differences in the paint. On the 1989 boat the pink stops ABOVE the canard wing as it extends toward the tips of the sponsons on the top edge. In 1990 the pink goes down inside the airtrap BELOW the canard wing. Plus there are small decal differences like the U-31 on one vert. The 89 also ran with a GOLD CUP CHAMPION on the sides of the cowl after Detroit on both the PL and SB.
I'm getting ready to make molds for all of these parts...Kevin is first in line for the SB cockpit and cowl.