Can I connect another pair of tweeters to the crossover?

Yeah if they crossover at the same point as these. If not I'd suggest making your own filters for them or going to an active setup

can i use it on toyota corolla 2006?

If the speaker sizes are 6 and 1/2 Then yes

Will they fit an 03 Jetta

Most cars, any component set will not be a factory swap because of the separate tweeter. It’s pretty simple to do on your own though if you YouTube installing component sets in a car. As far as fitting your Jetta, just google your car and speaker side and u should find out what size speakers have. If they are 6.5” you are golden, if not Rockville has other size speakers that should match what you need

Can I connect a bullet tweeter to those crossovers? Of course I will buy them separately and if yes, what power they recommend ...

That’s what I did. Much better highs using a good horn

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🎶 Elevate your drive with sound that commands attention!

BASS THAT MOVES YOU - Injection-molded polypropylene woofer ensures rich, punchy lows every drive
CRYSTAL CLEAR HIGHS - 1.2” PEI dome tweeters provide crisp, extended treble for immersive clarity
POWER THAT PACKS A PUNCH - 750W peak and 140W RMS deliver concert-level sound in your car
SEAMLESS FIT FLEXIBLE INSTALL - Shallow 2.17” mounting depth with versatile tweeter placement options for any ride
BUILT TO LAST BUILT TO PERFORM - Durable butyl surround and ferro-fluid cooled tweeter magnets for distortion-free longevity

The RockvilleRV65.2C 6.5" component car speakers deliver a powerful 750W peak output with CEA-compliant ratings, featuring a polypropylene woofer for deep bass and PEI dome tweeters for crisp highs. Designed with a precision 2-way crossover and durable materials like butyl surrounds and ferro-fluid cooled magnets, these speakers ensure clear, distortion-free audio and flexible installation in most vehicles.