If you've got a Stronglight 49 (50.4 bcd) you can get new TA chainrings for it:
https://www.veloduo.co.uk/products/n...f53c078e&_ss=r
Edit: TA rings in the link are outer 52-40 + inner 42-26
Here's what it looks like (new TA 52+36 on front + 13-28 New Winner ultra 6 on back):