For anyone who happens to need this in the future, the head size of the charger is 55mm x 25mm and it needs to output 19v at 3.42a.
What I found really useful was buying some of these, they connect a USB-C charger to this laptop:
https://www.aliexpress.com/item/1005004643148006.html
Make sure and get the 19.5v with a size of 55mm x 25mm. They work with my laptop with a few different USB-C chargers, even those as low as 45w.