If you are looking for cheap/Ebay housings, go with either of these:
89-94 NISSAN 240SX EURO DIAMOND H4 H6054 HEADLIGHTS | eBay
89-94 NISSAN 240SX EURO 200mm H4 H6054 HEADLIGHTS KIT | eBay
The Autopal housings actually have great cutoff, but the reason they are so cheap is because the glass is not as thick as the pricier brands.
If you desire something fancier, there is Cibie, Hella, and Bosch.
Everything else is garbage.