Mazda MX-5 Miata Sport 2007 Manual page 538

2006-08 TRANSMISSION Automatic Transmission Overhaul - MX-5 Miata & RX-8
39. Install the B1 brake piston component and return spring to the transmission case as shown in the figure.
Fig. 302: Positions For Installing B1 Brake Piston Component And Return Spring
40. Install the SST as shown in the figure, and compress the piston return spring.
Fig. 303: Identifying SST
2007 Mazda MX-5 Miata Sport
Fig. 301: Position For Installing Snap Ring