thanks for the fast reply, you saved me many more hours of looking for a different connector bushings.
it was a pig to get open without damaging it. you have to pry back the 4 tabs which are visible on the back surface where the wires enter the connector. while prying them back maintain pressure on the coloured part with your thumb, so that the tabs don't re-engage. once the 2 parts of the body are separated you can slide the pink lock out and instal the connectors with a satisfying click.
the picture shows the original BMW 61130005199 bushing, unfortunately they came with a preinstalled wire, I plan to use MQS Fakra connectors with weather seals for final installation. This will allow me to use longer coloured wires and avoid extra joints.
I'm now waiting for the correct crimping tool from amazon. maybe I should have paid the express shipping.