These 1:29 G Scale boiler stanchions were designed for a friend for his customized Aristocraft 0-4-0 Steam engine.
Two types are available:
24 Smokebox Stanchions
here: 8- 3mm high to hole, 8- 4mm high, and 8- 5mm high
(4 3mm stanchions removed from investment casting)
4 Boiler Stanchions
here: 
