Abercrombie in particular has successfully filled in as goal-kicker for the prolific Ben Botica, one of the players lost to the Harbour ITM Cup squad.
Silverdale won the Harbour championship for the one and only time in 2003 under the present coach Charlie McAlister and with one of this year's side, Andrew Gowling, as halfback.
Only McAlister's son Luke has been lost to representative duty, but the former All Black has had little involvement in club rugby this year.
Silverdale loom as formidable opposition to Shore, and also had a beneficial semi-final match, a thrilling win over Massey.
They also have experienced players in Gowling, a regular Harbour second XV representative, and two former representative players, Mikaele Tuu'u and Ryan Wilson, in the pack.
The final will be at the North Harbour Stadium, kicking off at 4.15pm.
East Coast Bays and Northcote will play in the plate final at 12.45pm.