I already have stainless handholds. I want to know if I could connect them on the device (with spooky boost) to use as a contact generator ? (if it’s yes, can you give the way to connect them knowing I use them today with frex an alligator clips).

If you can connect your already having hand holders with BNC connector, then there is no problem to work together with Spooky2.
If you need Spooky2-5M generator, you can directly place the order from the link:
http://www.spooky2-mall.com/spooky2-generator/spooky2-5m-5-mhz-generator.html
We have it in stock and will arrange the shipment for you right after order confirmed.
 
This is the link for our Spooky2 Facebook group.
http://www.facebook.com/groups/spooky2/
This is the link for our Spooky2 Forum
http://www.spooky2.com/forums/ 
I am convinced these 2 will help you a lot.