Those LX cranks are very good mines lasted 2 years plus and is now on my Kona HT the anodising has all rubbed off the middle ring died after about 6 months so replaced it with a deore streel ring. oh and i stripped the extractor threads but apart from that its fine ;-) ((just remember to remove the washer before you try to use the crank extractor on them))
You will need a 10mm alan key as well as the hollow bolts are err 10mm not 8mm
from your earlyer postings you want a Octalink BB 68mm shell width and a 121mm axle