Mazda MX-5 Miata Sport 2007 Manual page 556

2006-08 TRANSMISSION Automatic Transmission Overhaul - MX-5 Miata & RX-8
Fig. 341: Identifying Snap Ring On Accumulator Pistons A, B
97. Install the accumulator pistons A, B and the compression spring to the transmission case.
CAUTION:
98. Apply ATF to the new transmission case gasket, new brake drum gasket and install the transmission case.
2007 Mazda MX-5 Miata Sport
Do not damage gasket.

Fig. 342: Identifying Accumulator Pistons A, B And
Compression Spring