odonnell blue glow plugs

hi fellow boaters i have 37 new in pkt odonnell blue glow plugs that i wish to trade for glow plugs to suit 21 engines. i run 50% nitro and run nova rossi and cmb vac aswell as mac 21 ,, if no luck with trade i will sell all 37 as one sale,, tell me what you got,, cheers jason ,, i think im...