Looking to replace the two O rings & the little seal on the ECO 97-98 check valve assembly. Any certain sizes?...
Welcome. Pretty sure they sell them on Ebay.
This what you need?
http://www.ebay.com/itm/Eco-air-meter-Rebuilding-kit-/252570319865?hash=item3ace5d3bf9:g:seUAAOSw241Yf-me
or
http://www.ebay.com/itm/Eco-air-meter-Check-Valve-kit-/252571082725?hash=item3ace68dfe5:g:-bMAAOSwPCVX9RA2