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The standard Align T-Rex 450 SE/V2 tail boom is 12mm in outer diameter (OD), 11mm in inner diameter (ID) and 347mm long. Here are some exactly compatible booms:

• Align T-Rex 450 XL/SA/SE/V2/Pro: (12mm OD; 11mm ID; 347 mm length)
• EXI 450 (12mm OD; 11mm ID; 347 mm length)
• HK-450 (12mm OD; 11mm ID; 347 mm length)

Mostly compatible:

• HDX-450 v4 (12mm OD; 11mm ID; 343 mm length)
• Belt CP (12mm OD; 11mm ID; 352 mm length)
• Blade 400(12mm OD; 11mm ID; 360-364 mm length) -- need to cut down to length

Not compatible are:

• MiniTitan e325 (14mm OD)