What power adapter do I buy?

I have a Studio 1557.  Model number PP39L.

I lost my power adapter/charger and need another one. It says it needs ADAPTER PA-12, PA-2E, PA-3E.        iNPUT 19.5V, 3.34/4.62A

I want to buy one that is compatible with my laptop but because the 1557 was a short lived model (first i7 CPU for DELL laptops) it was quickly replaced with different hardware some time last year and rebadged as 1558 if I am not mistaken.

I can't find on Dell.com.au a power adapter charger that says it is compatible with this model. The only studio 15 listed is the 1555.

Could I please get some guidance on the compatible power adapter/charger to buy.

Thanyou for your time and assistance.