I'm considering buying a couple of crossover turnouts to use instead of using four conventional turnouts to achieve bi-directional transitions from two parallel tracks. I can't find any information on the dimensions of the crossover turnouts. Can anyone tell me how long they are and how far apart the tracks are? I have two parallel tracks, one using 22" radius bends and one inside it using 18" radius bends.

Also if I buy DCC crossover turnouts, is each individual turnout in the set separately programmable or do they both operate together?

Thirdly, where's the best place online to buy DCC track components? I live in Australia, so it needs to be a retailer who will ship overseas.

Thanks in anticipation.