The cartridge I've received is a different shape to the one I've removed
Compatible, "own-brand" cartridges will often differ in shape to the genuine equivalent cartridge. Double check that the code on the packaging, and the code on the product are the same as the cartridge you are removing. If it is, go ahead and try to install the cartridge. The fit may be slightly different, but the cartridge should still print correctly.
If you are unsure, please contact us and we'll be happy to help.