I changed my mate’s old style Clio radio, but we never bothered connecting the stalk on both of our cars. However all hope is not lost Car Audio Direct do adapters for them. They sell two bits of hardware to achieve this 1. Is a vehicle adapter and 2. Is a radio adaptor. I believe you need both, but im sure there is a guild on there site that tells you.
If you call them they will be able to help you. There a really good company, I have ordered loads of stuff off them and are quite reliable.
Hope this helps.