4x114.3 is a common pattern, as said you can get into some wheels aimed at the conservative side of the S13 market.
Alternatively in a similar vein, basically all your Japanese wheel manufacturers will produce custom sizing in their multi piece wheels. You just need to find someone to go through to order them that won't rip you off. The Japanese wheel sites have PDFs of sizes, showing how much dish per width and offset, but those offsets on the sheet aren't all they offer. You just need to ask them.
This obviously isnt the case for single piece more concave type wheels, what they list for those is generally it.
i'd say look at Weds, SSR (part of RD Tanabe), Work Wheels as a start. They all offer special 4 stud versions of many of their popular wheels, or they can be made in 4 or 5 stud. I prefer looking on the proper Japanese sites as you get the full range, also you get to see all colour options, centre cap options, valve options, brake clearances etc.