Apple //c monitor transformer replacement

Hi all,

One of my apple 2c monitors have a faulty AC transformer. The secondary coil is open. That's a 16V AC one. I'd like to replace it, it won't be identical but as long as it fits...

The original one is 60x60x50mm. The ones I can find online are 60x50x32 but only 20W. According to the schematics, the 16VAC is a 1A line so that's 16W. 20W transformer feels a bit tight. But all listings I can find online show the same dimensions.

Are there any options anybody could think about?

Thanks!