Dave,
According to the review section
here, there was no dedicated hood for this lens. I have the same hood I believe and it is about 50mm deep with 58mm threads. I have a better assortment of 49mm threaded hoods and based on my experience with those I would think something in the range of 35 - 40mm deep would work, but that is just a guess. AFAIK though the only Pentax round hood made in 58mm is the one you have so if you want a shorter one you will need to go with a replacement one. Check the auction site should find something there not too expensive.
Best,
John