Yes, Plug cover same size from Evo 4-9. Block head cover also same size.
But I just want to give my sincere opinion to all members (don't mean to kacau SS's sales la, after all we are all MLOCian but I need to be fair to everyone), the plug cover seems to open the inner part of the plug cap to rain water / car wash (as the Mitsubishi wording seems to be see through holes) based on the pics, unlike the original or most OEM replacement specs (Kansai, HKS, Tomei..etc).
Unless it comes with arcylic or somesort of plastic behind/underneath the Mitsubishi wording, please be careful when gushing water (car wash) as water might potential seep through the plug cover now that it seems exposed once you install this cover.
Lastly, It looks cool ! I'll wait for Leslie, Chris and Oonbc become guinee pig first la..hehe.