OEM lsd rebuild kit and exterior parts

[NightAddict]

Hi, I have a Levin hatchback from 84` with 124hp and a factory LSD. I want to order from here: http://www.weirperformance.com/maxgriplsdkits.html; now what is the difference from Toyota Corolla AE86 GTS-all kit and the AE86 Corolla GTS TRD MAXGRIP kit? AND if I buy a spool, wich one should I get: GTS Corolla 6.7” Zenki axle or GTS Corolla Weir Performance 30mm Axles? If i install the spool are there any problems in the future(transmission problems etc.) different from the LSD? I am asking this thinking that some of you also went trough this, and I`d like to know some opinions before buying something. I would like to find out how often do I have to change the diff oil and what grade to use and capacity after the rebuild. I also have some problems with the exterior of the car for the moment, are there any tuning headlights, I have found on ebay some tuning taillights for the hatchback that are cheaper than the original ones. Also I would be interested in some clear front bumper signals, they would look nice I think.