I often use after market hoods even when I own the original (which are too expensive to damage / lose). If you cannot find one in 48mm that you like, buy a stepping ring (e.g. 48mm to 49mm) and use a lens hood that fits that (It's a good solution for filters too if you cannot find filters in 48mm) . Stepping rings cost maybe one dollar on eBay. I also always keep my eyes open when visiting a camera store. They often have boxes of vintage hoods, filter etc., that have been reclaimed from traded in lenses and sell these cheap. I have picked up some real bargains.