These GR-2 KYB's are okay replacements for the stock Nissan shocks. When the full gas shocks were available (we still have them in stock) all other Datsun vendors raved about how great the performance was and couldn't say anything bad about them... then. Now it seems they push only what they can get. Well, we offer both and although other Datsun vendors favor the economy series, it seems biased. Our customers and the Datsun Roadster world from the past and present still love the full gas series. We don't fall out of love with something just because it becomes obsolete. If this were the case, we'd all be driving Miata's. No disassembly necessary of lower control arm to install.