There are four sts beampipe can be used with different sts_version as described below

v21a: Old beampipe, can only be used with sts geometry version: sts_v21[a].

v21b: New beampipe. It has 40mm diameter upstream side and 104mm diameter (including cylindrical part) downstream side.
This beampipe can be used with the sts geometry version: sts_v21[b, d, f, h].

v21c: New beampipe. It has 55mm diameter upstream side and 104mm diameter(including cylindrical part) downstream side.
This beampipe can be used with the sts geometry version: sts_v21[c].

v21d: New beampipe. It has 40mm diameter upstream side and 104 diameter(including cylindrical part) downstream side.
This beampipe can be used with the sts geometry having a target position at -44 cm. which means it can only be used with the
sts geometry vesrion: sts_v21[e, g, i].

magnet_v21a is the shifted verison of v20a
magnet_v21b is the shifted verison of v20b
rich_v21a is the shifted verison of v17a_1e

Shifted by 40cm consistent with the change of coordinates from
old target position to centre of the magnet.

Having seperate translation for pipe_v16c causes problems for inclusion
of MVD. Translation via node shift instead.

As created by their respecitive macros.