i really have no clue, ive searched and couldnt find anything. all i found was from howell automotive:
realy ive been trying to fond what there going for.
howell automotive has:
Stock Replacment Intake and Exhaust Rockers and Spacers
Qty: x $299.95
SBI Rocker Arm Set DOHC 2.0/2.4
Qty: x $139.95