a quite small 150 mm f 12.5 wollensak should cover the 6 x 24 just fine. Also as mentioned the 165 6.8 Angulon, I use a 210 5.6 Sironar S on my 8 x 10 not much movement but it would do fine on the 6 x 24

..personally I think a 90 mm f/8 fugi on 6 x 17 is quite nice and easily enlarged on a 5 x 7 enlarger and offers more options. i.e. sharp at f/8 quite effective as a hand held street format and the enlargements are impressive....4 shots per 120 roll...