What specific part do I order to replace a broken trunk spring-loaded bumper? on 2006 BMW 330Ci

One of the 2 bumpers or buffers on my trunk lid is broken. These rubber bumpers have a spring-loaded piston that pops open the trunk when the latch is activated in the car. I have searched parts suppliers online and it appears many different buffers were used and I want to make sure I buy the right one. Where can I source and what is specific part number?

Asked by for the 2006 BMW 330Ci