Dang. I thought I checked the non-stock option. Grr. I do see that Mouser has a 10 watt, 1.6 k in stock. If you can do 1.5K Mouser has plenty of in stock options and that is a less than 10% difference. What is the tolerance of the original part?
Here is a 18k, in stock and 25mm.
https://www.mouser.com/ProductDetail...reHfLvJIcaE%3d