Sorry if this has been covered before but I didn't find it anywhere. My lsd is worn out so I am going to go order the discs for it from mazda or maybe mazdatrix. Is there anything else thats needed? And how many discs do I need to order or is it just one part number?

I'm pretty sure I can get the lsd out but is it very hard to actually take the lsd unit apart and replace the discs?