Mouser. They're made by Ohmite - same old company that's been making them for decades. Not cheap, but the quality is good.
https://www.mouser.com/c/passive-com...ite&series=210
Another options to retain the look and original mounting while keeping the price down is put a couple in parallel.
For example to get 610 ohms, use a 25W Ohmite 750. Note the sample image is deceiving. They are nowhere near that long.
https://www.mouser.com/ProductDetail...Qtnr75uQ%3D%3D
with a smaller 5W 3.3K in parallel. You could hide it behind for appearance.