I need to finish my Eminence 6.5x2 Samsonite suitcase speaker, and maybe another type during the winter, and realized I do not have female spade connectors on hand. Are they of a standard size, or does that vary? 1/4 inch? Where do you buy yours? A hurried look at H-D showed only insulated expensive ones in super-mini packs... but again, I will need a dozen at most.