NEW Diamond pistons plasma moly top ring, std bore, 1.5mm top, 1.5mm second, 3mm oil ring. Will fit most brand pistons as long as your piston have the same ring thickness. part# 09063552
I cannot confirm for stock 03-04 cobra piston but i have measured a stock 98 cobra pistons and it will fit.
I also found the same specs for stock 2V:
Ring Groove Width
· Compression (top) 1.530-1.550 mm (0.06-.061 inch)
· Compression (bottom) 1.520-1.540 mm (0.06-0.061 inch)
· Oil ring 3.030-3.050 mm (0.12-0.12 inch)