Nope, won't be easy to find it. I don't remember where, but about 10 years ago I bought a variety "sampler" of e-clips of almost every size. They sure have come in handy over the years.
Here's a tip: Solder a miniature washer onto the top of the needle clip and slide other washers onto the needle clip to adjust height. The washers I use are from a repair parts kit to repair roller mechanisms in cassette tape and VCR recorders. if you got a cassette player, you can always tear one apart for eclips and washers. No one uses those anymore anyway