PBT keycaps on the Blackwidow X Chroma

Hello, I recently purchased the razer pbt keycaps for my blackwidow x chroma. I am having some issues fitting the spacebar on the existing stabilizers? Should I replace them with the stabilizers that come with the keycaps? If so, how would I do this? The keycaps say that they are compatible with any razer keyboards and I would like to be able to use the full set. Thanks