Durga spurs

[Hog]

Continuing my "what can we break this week" theme - I managed to strip the 91T spur in my Durga this week thanks to a pinion that came loose.

Is there an alternative to the kit 91T (running without the slipper at present) as the gear chart posted here on Oople suggests using a B4 spur as an alternative? Or do you need to be running the slipper for that and I'm stuck with 91T? I was just looking for a little more flexibility with my gear ratios that's all.