Allen 4" Hatch Cover Rim
Holt Hatch Cover Rim 4"
For small Dart 18 hatch cover, each rim will require 6 x SSM Alu/Alu small rivets for fixing (not supplied, see Marine fixings for details). These rivits are larger diameter so you can drill out the old smaller original type to give a new fixing.
Steves tip "when fixing to deck it is advisable to use a marine sealant (see 'Marine fixings'). On older Darts the deck cut out will need filing around the edge to ensure a snug fit before fixing" size of cutout 109mm.