aerotaff, do you remember what the shock mod was?
4 seaters are great.. note that the post 1999 cars won’t be able to fit a car baby seat if that is your requirement from day 1. I have a 1996 +4 4 seater and you get 2 Brittax Evolvas in that but only just, not sure it would fit in a narrow chassis car if you need to fit 2 like me..
My dad has a 2007 Roaster 4 seater, it’s great, great to fold down the seats and you even have a boot! An adult can even fit in the back with the hood up!
Options will depend on budget but all versions have their merits