ABERGAVENNY and Oakdale will battle for the WRU National Bowl at Principality Stadium as well as for the Division Three East A title.
The Gwent pair secured their places at finals day on Sunday, April 28 with nervy semi-final victories.
Abergavenny edged out Nantgaredig, who are unbeaten in Three West B, 25-23 at Llanharan.
They trailed 20-10 at the break but snatched victory with the last play of the game to spark wild celebrations.
Oakdale also won a thriller, beating Bridgend Sports 20-15 of Three West Central A at Taffs Well with tries from Connor Jenkins and Shane Kerby plus 10 points from the boot of fly-half Simon Veall.
Oakdale currently have a two-point lead over Abergavenny at the top of Three East A with both teams having lost just one of 14 fixtures - to each other.
In January Oakdale won 27-0 at the Recreation Ground while Abergavenny took the spoils 13-7 when they were the hosts in October.
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