diff --git a/printer_mods/Long/Mantis_Dual_5015/Carriage_v1.036.stl b/printer_mods/Long/Mantis_Dual_5015/Carriage_v1.036.stl
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index 000000000..aaaae4336
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diff --git a/printer_mods/Long/Mantis_Dual_5015/Chain_Anchor_v3.1.stl b/printer_mods/Long/Mantis_Dual_5015/Chain_Anchor_v3.1.stl
new file mode 100644
index 000000000..648cc2529
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diff --git a/printer_mods/Long/Mantis_Dual_5015/Duct_v1.033.2_Left.stl b/printer_mods/Long/Mantis_Dual_5015/Duct_v1.033.2_Left.stl
new file mode 100644
index 000000000..9370c8135
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diff --git a/printer_mods/Long/Mantis_Dual_5015/Duct_v1.033.2_Right.stl b/printer_mods/Long/Mantis_Dual_5015/Duct_v1.033.2_Right.stl
new file mode 100644
index 000000000..5e06a5db6
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diff --git a/printer_mods/Long/Mantis_Dual_5015/Magprobe_Dock_Arm_v1.0.stl b/printer_mods/Long/Mantis_Dual_5015/Magprobe_Dock_Arm_v1.0.stl
new file mode 100644
index 000000000..4fe4d8e95
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diff --git a/printer_mods/Long/Mantis_Dual_5015/Magprobe_Dock_Mount_v1.0.stl b/printer_mods/Long/Mantis_Dual_5015/Magprobe_Dock_Mount_v1.0.stl
new file mode 100644
index 000000000..5f4c292e6
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diff --git a/printer_mods/Long/Mantis_Dual_5015/Magprobe_Longs_v0.31.stl b/printer_mods/Long/Mantis_Dual_5015/Magprobe_Longs_v0.31.stl
new file mode 100644
index 000000000..5f4d522dd
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diff --git a/printer_mods/Long/Mantis_Dual_5015/Mount_Dragon_v1.036.stl b/printer_mods/Long/Mantis_Dual_5015/Mount_Dragon_v1.036.stl
new file mode 100644
index 000000000..6904cba32
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diff --git a/printer_mods/Long/Mantis_Dual_5015/README.md b/printer_mods/Long/Mantis_Dual_5015/README.md
new file mode 100644
index 000000000..934284fa9
--- /dev/null
+++ b/printer_mods/Long/Mantis_Dual_5015/README.md
@@ -0,0 +1 @@
+Longs Mantis Dual 5015 Toolhead for v2.4 and MGN12h.  Please read the readme.pdf file.
diff --git a/printer_mods/Long/Mantis_Dual_5015/Readme_v1.02.pdf b/printer_mods/Long/Mantis_Dual_5015/Readme_v1.02.pdf
new file mode 100644
index 000000000..4cc0b2291
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diff --git a/printer_mods/Long/Mantis_Dual_5015/Umbilical_mount_v2.stl b/printer_mods/Long/Mantis_Dual_5015/Umbilical_mount_v2.stl
new file mode 100644
index 000000000..63b8f0c5d
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diff --git a/printer_mods/Long/README.md b/printer_mods/Long/README.md
new file mode 100644
index 000000000..08dc91866
--- /dev/null
+++ b/printer_mods/Long/README.md
@@ -0,0 +1,2 @@
+**Longs Toolhead Mods**
+
diff --git a/printer_mods/README.md b/printer_mods/README.md
index bc1e92139..a849fc744 100644
--- a/printer_mods/README.md
+++ b/printer_mods/README.md
@@ -131,6 +131,7 @@ like so:
 ||[Galileo adxl356 mount](./leandromarceddu/GalileoADXL) |Modified galileo chain anchor to fit an adxl356|:x:|:heavy_check_mark:|:heavy_check_mark:|:heavy_check_mark:|
 |littleferris |[V0 c14 Skirt Inlet](./littleferris/V0_Skirt_Inlet) |V0 C14 Skirt inlet |:heavy_check_mark: |:x: |:x: |:x:|
 |LoCoCNC| [MGN7H Shims](./LoCoCNC/MGN7H_Shims) | Shims for making bearing cartridges coplanar |:heavy_check_mark:|:x:|:x:|:x:|
+|Long| [Mantis Dual 5015 Toolhead](./Long/Mantis_Dual_5015) | v2.4 MGN12 Dual 5015 Toolhead  |:x:|:x:|:heavy_check_mark:|:x:|
 |madros |[V0 OLED-skirt](./madros/V0_skirt_OLED) |V0 skirt with 0.96" OLED|:heavy_check_mark: |:x: |:x: |:x:|
 |MarcPot |[UHP PSU Bracket Clip](./MarcPot/UHP_PSU_Bracket_Clip)|DIN rail mount for the Mean Well UHP series PSU. |:grey_question: |:grey_question: |:heavy_check_mark: |:x:|
 | |[Hour Counter Skirt + Keystone Skirt](./MarcPot/Skirt_Mods)|Skirt mod for a mechanical hour counter and keystone inserts |:x: |:x: |:heavy_check_mark: |:x:|