Edited and now including pic:
There is a 914 specific 4x130 alloy wheel that may not be the best looking but are definitely one of the most funtional. Back around '82-83 there was an outfit called "Specialty Racing Wheels" who made a set of 15x7 wheels for 914's with different offsets for fronts and rears, #M7C. They were a two piece modular wheel. They sort of look like a cross between 8 spoke Empis, Minilites and HRE's, but the center portion was more prominent/raised. They were on a few VW & Porsche Magazine 914 project cars back in the early 80's and a European Car mag project car in April '83.
I had a 73 2.0 with these wheels and 215/60/15's fit under stock fenders w/ no problem. I later sold that 2.0 to TC.
Here's a a pic of them from a 2010 VW & Porsche 914 project article.
Click to view attachment...and my 73 914 2.0 after TC bought it.
Click to view attachment