This is a set of two new high quality spring bars made to fit the Omega Seamaster Planet Ocean Chronograph 45.5mm strap stamped 98000290. These are not made by Omega but are high quality parts made to fit this strap securely.
There are photos of your spring bars from multiple angles to help you assess the details before ordering.
If you are not sure if this will fit your watch or if you have any other questions, feel free to email me at Sales@TheWatchLink.co.uk. I'm happy to help!