I like the DR-20's as well. The real Work center caps fit nicely so one could flaunt real JDM if at a show , etc.
"Old school" is relative to your age, for me it would be the late 70's and 80's. This is when the Japanese were making new records in auto technology through JGTC. The widebody, fender flare, large tachs, vinyl graphics and guages all along your A-pillar, were copied by the enthusiasts of the time. They were called bosokuso's. I would call that JDM styling.
It was also during this time that J. brands started to build a reputation for making high quality performance parts. Since it's so expensive to own a car, the owners were/are willing to pay high dollar for the best parts, and since the Japanese are known to be very prideful, the advancements were not copied but made better. Thus evolving the quality and performance of their cars. That to me is JDM as well; putting the best parts you can find while being unique in your choice. I would CRINGE if my exterior/interior/under hood could be mistaken for another's.