Nikko flip ups
Optics warehouse have them. Not the best quality in the world, but the only ones I could find.
I would give them a ring and make sure they are in stock (60mm ones).
Daystate Mk4 iS ST (Huggett shroud & Mod .20) Lightstream 4.5-14x44 FFP
Daystate Grand Panther (Grand Prix stock, .177) Nikko Stirling Diamond 10-50x60
Daystate Panther (Gary Cane custom stock, .177) Sightron SIII 10-50x60