in need of one P3614542 new valve spring

I have my x heads being rebuilt and it's come down to reassembly time and I get the dreadded phone call-from a reputable engine shop -"hey one of your MP valve springs is missing an inner damper spring". Now the thing is that I bought these springs all new in their little individual boxes off ebay a while (like over a year) ago and this number is no longer available from MP . so NOW WHAT? Anybody got one?
Thanks!
Bill