ImpcoRK-J Repair Kit For Model J Converters

What special tools do you need for installing this kit?

This kit fits the jb2 model converter ? What are the differences ?

Will this work for a hyster forklift with p/n 8504584?

I have these two on my nissian f.l.- nolff's n-vff-30-2 and impco model j i want to replace both. can you point me to the units?