91 mr2 suspension ??

If you buy "Sealed", generally yo uare getting an antire assembly.

With the MR2, you only need the actual cartridge. You dissassemble the strut assemble and just replace the cartridge.

I have the KYB AGX (4-way adjustable) from summitracing.com.

The only sealed strut option you have are bilstein struts.
kyb, tokico, koni, and I guess toyota sell replacement cartidge insert with dampening adjustability(except oem.)