This is what's left:
1- Mazda silver
1-Nissan short black (RB/ka/Sr)
Machined from 6061 aluminum. Super lightweight design (3oz). Seals with a high temp Viton o-ring. Higbee (blunt) start and end on the threads for zero sharp edges, and no chance of cross threading. Tumbled to a semi polished finish and then anodized in your choice of clear(silver) or black. Caps are engraved before anodize for that stealth look. Limited run. Pre-order to guarantee you'll get a cap.
Mazda fitment M35x4 thread for most all Mazdas.
Nissan L-series fitment- M32x3.5 w/long threads and super low profile. (Also fits some Honda's)
Nissan newer RB KA SR fitment- M32x3.5 w/short threads and offset top to raise cap off valve cover seal surface.