I have just fitted these lights in mine , re the vacuum leveling , I do not intend to attempt the mod suggested a few pages back.
Will the pipe need sealing ?
Yes, seal the pipe.
Just cut off ends an inch back and tape to old lights for storage (so you can re join connector later using a bit of rubber hose if req) and use a bit of hose with a ball bearing, screw etc stop off end of hose.
Note: USA models do not have the adj vac pipe.
Linear Mode
