Ex works, we only offer the handlebar and stem combinations that are shown on our website and in our web shop.
However, it is possible to adapt the stem or the handlebar afterwards. But please note that changing the stem or the handlebar will also change the geometry of your bike and might lead to a different riding behaviour. If you still want to change the components, please write us under support@bzenbikes.com or contact one of our official service centers or a professional bike shop. We and our partners can provide you with further advice and/or help you with the change. We, however, do not encourage you to make the changes yourself as such actions require proper tools and experience.