ive fitted modified hr31 front struts, had the smaller c210/r30 spring platforms fitted as the r31 springs r massive... these bolt to stock c210/r30 steering arm, have floating hub and 100mm caliper spacing same as s13 so makes for good upgrades, shorter tube than original so at a lowered height will have more travel, wide range of inserts easily available bilstein/koni etcetc, and still use standard fitment springs and tops. hubs can also be redrilled to 5stud easily if u want to go that way.
if this interests you ill have 2 sets of these modified hr31 complete struts forsale soon as im going coilovers in both cars.
jon.