Bellhousing Mazda 13B for OS-FR7 transmission


Regular price $1,200.00 Save $-1,200.00
0 in stock

OS Giken provides engine specific bell housings for installation of the OS FR7 Gearbox. This aids in the installation of the universal gearbox for select engine platforms. 


  • RX7 (FD3S) 13BT - OS FR7 Gearbox Equipped

Product Details:

  • OS Giken OS-FR7 - 7 Speed Sequential Bell Housing - RX7 (FD3S) Specific
  • Designed to bolt directly to 13BT Engine.


The “Pre-Order” order option is enabled when the listed item is either temporarily out of stock, or is only available as a “built to order” item from our factory.

Once an order for a “Pre-Order” item is received, we will confirm lead-time with our Japan factory and contact you within 1-2 business days via email with current projected production lead-time information and delivery date projections. After accepted/authorized we will proceed with finalizing your order. If the quoted lead-time is not accepted, the order will be promptly cancelled and you will be refunded immediately in full.  

If there is further delay after your placed order, we will contact you with an updated delivery lead-time or provide you with the option to cancel with a full refund for any unfulfilled order items.

While there is no risk in ordering “Pre-Order” items through our website, feel free to contact us ahead of time regarding product leadtime.

California Prop 65 Warning

*Warning: This product can expose you to chemicals known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to: