All-in1 Chassis
For Igniter Mini or Spark, with Recharge port, VECO 2W bass 28mm Speaker. It has a 1.24" OD (slide into MHS V1) and a 4.33" length. It has holes for 4-40 threaded rods, that matches chassis disks...
An adaptor is available here for I2 / Spark Color 2 / Spark 2