A pity you lost it because that hood is very versatile and can serve on other lenses as well, including the Coastal Optics 60/4 APO, UV-Nikkor 105/4.5, and the 45/2.8 Ai-P Nikkor.
The HN-35 (for 45/2.8 ) will work, but is very elusive and/or expensive. You can easily make a nice hood yourself, though, by combining a K-4 ring with a 52 > 3940.5 or similar step-down ring. If necessary, add a reversing ring 52-52 mm to get the thread genders lined up correctly. When the pieces come together and match, seal the joins with a few drops of epoxy glue.
The simplest and cheapest solution is just using a K-5 directly.