I don't quite get what you mean. I've never seen a connector that will allow you to remove a LED from an enclosure, they are normally fixed in place. Something like this
A male plug with a black and red wire already connected and a female plug with a black and red wire already connected.
10 pairs (20 connectors; 10 male, 10 female).
They are of a decent quality, especially for the price.
No problem. Just be aware that if you order from DealExtreme, it takes a while to receive... maybe 2-4 weeks on average. I typically only order from them on stuff i don't need in a hurry, or stuff that i've already got from them and are running low just to restock before i run out. I found that the JST cables are good enough that i keep some on hand. You can find them online from other dealers by searching for JST cables, but probably not as cheap as DX.