The lil' bolt on things that move your shift linkage up the shifter are ADAPTERS. They are not bad, but the fact that it is bolted on to the shift lever, leaves alot of extra lateral play, and they make actually weaken/break off the attachement flange. Avoid the adapters if you can...

If you want a TRUE short shifter, the best available for the 5th gen are (were - he quit making them) made by LEAN, You may be able to find some for sale on various Prelude related sites and Ebay. But expect to PAY ~300 . There isthe PSpec SS kit is available now, its almost a rip off of the LEAN kit, and my personal experience with both say that its within 5% of the LEAN. Its just not as secure feeling,

Forbidden motorsports SS, for 4th gens, owns anything else available for the car. There are multiple settings, and at the shortest setting the throw per shift is around 2-3 cm. Only thing is, in that setting it moves the shift knob approx 1.5cm to the right (out of center). For tall people whose kness get in the way (like me), its fine.