GSXR Throttle Bodies

[Wynand]

Decided to go for motorcycle TB's on my Blacktop Zetec 2.0 and contemplating which set to order from Ebay. Here are some questions and would like some feedback and advise please.

1. I have a choice of the following GSXR TB's. 600, 750 and 1000. I fancy the 750's but which is best for my specific motor.

2. When using the TB, is it best to remove the Zetec injectors and use the TB injectors fitted or best to blank off the TB injectors and use the Zetec fuel injectors?

3. From those that had used Ebay - is it safe to use, what are the chances that after one made payment, stuff is not send?

Thanks