They are a standard item in our line. We began offering them with the release of the Endura4 and Delica4. The first Endura and Delica to offer all screw construction. When first released we had a lot of ELUs take them apart (not because they needed to, but because they could for the first time). However, taking them apart doesn't mean they can be easily put back together. We had a lot of people who lost small parts. The kits were/are offered to handle the issues with losing or damaging internal components.
I'm sorry the kits are only for the Endura4 and Delica4. They won't work on previous versions. We made a lot of changes in the 4th gen.
Hope this helps.
Kristi