TuneRC Poly F405 2S-4S AIO FC has soldering pads dedicated for M5-M8. Now, anyone can build a toothpick style 3" X8 by adding a 4-in-1 ESC and four motors with this plate and eight motor mount plates. Even if your AIO FC (F405 or above) does not have soldering pads dedicated for M5-M8, you  can still make an X8 by making resourse remapping LED_STRIP, unused UARTS, or unused SCL (I2C) to M5-M8, and making those pins enable timer and DMA (for DSHOT).

• FC and ESC Mount : 16x16mm, 20x20mm, 25.5x25.5mm, M2
• Wheel Base : 140mm
• Thickness : 3mm
• Weight : About 11g