I think it's often what we each are used to using.

Jim Carter's search does not seem to work.

Chevs of the 40s search has gotten better.

Classic Parts search is OK.

American Classic's search is pretty good.

LMC is OK - from their homepage, set up for your year and search on "windlace" (the word used by most people, above) - "wind lace" works, however

Brothers - you have to look around to find "windlace"