This is what I have done - fitted plates to the underside of the bottom plastic mount, drilled a 5.5mm hole and tapped the hole for the fitment of a 1/4" UNF short grease nipple in the plate which is aligned with a 1/8" hole through the bottom bush. See photo below for the finished article.
The grease will not effect the bush but will help alleviate wear and squeaks.
These are the plates I use for the bottom bush as the bosses fit nicely into the counter bore holes of the bush and keep the bush from moving/fretting.
https://www.merlinmotorsport.co.uk/p/an ... e-arb-mb-3
- antiroll bar mount and grease nipple.jpg (79.44 KiB) Viewed 40035 times