Oh, I see some of you guys think like hubby does... *sheepish grin*
Ian, I have the p-trap, I have what I need, and I have some plumbing knowledge. Just couldn't budge the thing.
NOTHING in this house is Standard. NOTHING can be bought at your local regular NHome Depot kind of joint. Everything is non-standard size (built in 1941), and almos tnone of it can be bought at regular stores. That's why I keep/hoarde a supply of parts for our old piping & fixtures. *sigh*
Most plumbers, when stumped, come calling here to see if they can buy a this or a that widget from us. I collect this kind of s*** when I find it, and when I see large amounts of trash collection at curbs. I trash-pick for old plumbing & electrical & hardware stuff...

I also buy at oddity stores and places where there are still old-fahsioned hardware stores with ancient stock.