Hi,
the rubber cap that goes on the brake bleeder screw - dealer charges ~$5. That's $40 for both the cars! Any idea if there are any aftermarket ones available for less or is this one of those 'dealer only' parts ?

 

okay Cheap Charlie LOL;
Get a piece of vinyl/rubber tubing, cut a piece about 1/2 inch long......here's the fun part....set one end of the tube on fire, after it is burning good squish it with a pair of pliers.

 

Deathzone Autoparts sells several universal vacume tap cap assortments. You can find your size there. You may have to buy two (2), but they're cheap. Use some grease to kepp any moisture out.

P