Ten Lake Shore & Michigan Southern/New York Central/Penn Central/Conrail 'Harp' Switchstands - priced at $3.00US per switchstand. Each kit includes seven different targets and three styles of switch lamp. Five of the stands have the handle thrown to the left side, five have the handle thrown to the right side. Shims are included to allow for easy mounting on commercial HO turnouts like Atlas or Peco.
They are also available in a:
-20 pack for $50.00US (priced at $2.50US per switchstand)
https://shpws.me/SWdH
Detailed assembly instructions are here:
https://www.shapeways.com/forum/t/new-york-central-ls-ms-harp-ho-switchstand-assembly-instructions.101634/
The Big Four version of the 'Harp' switchstand can be purchased here:
https://shpws.me/SK6t
They are very similar to the NYC Racor 112 switchstand assembly instructions available in the Tips and How-tos section of the Shapeways 3D Printing Forum:
https://www.shapeways.com/forum/t/new-york-central-racor-112-ho-switchstand-assembly-instructions.101565/
A magnifying headset (Optivisor) and a precision sprue cutter like the Intermountain BB-1015, Micro-Mark #82393 or UMM-USA GMT01 are required to cut the parts from the support framework.
https://umm-usa.com/onlinestore/product_info.php?cPath=21_28&products_id=3749