[Closed] x7 jockey wheels - obviously not all the same.

hello, any ideas please.

Just serviced my bike, new cassette and chain. Jockey wheels could do with replacing, so i go online and search for X7 jockey wheels, find some at a reasonable price and buy them.

The ones i have removed from my bike, have a sealed bearing ala a skateboard wheel. the ones i have bought have a solid bushing (they are sram manufactured and say for rear x7 deraileur)

I would fit the ones i have bought, but the bolt will not go through the bushing.

So how do i identify the correct type to buy, I have a sram X7 rear, long cage.

Many thanks