Replacement fader knobs

[RideTheCrash]

The knobs for my faders have seen better days. I want to buy some new ones, but they aren't made anymore. I've been directed to a few electronic supply sites, but none seem to carry any fader knobs.

Yorkville says their new knobs wouldn't fit my old stem. I've been searching for a couple days online and I usually just find DJ crossfader replacement stuff, but this site:
http://www.maplin.co.uk/Module.aspx?ModuleNo=19662&TabID=1&C=SEO&U=SEOsearchPages&doy=search

Seems to carry the right stuff...of course the site is UK based though. The bigger black fader in the picture is extremely similar to mine. I like the fact it lists the dimensions. I'm not sure if my fader is a 4mm or an 8mm (I'll assume 8mm), but I've also been told there is no standard sizing for this stuff.

Is there any place online anyone knows that sells more of this stuff and could maybe help me figure out the right size I need? It seems a bit impossible, but it's worth a shot I suppose.

 

[RideTheCrash]

This site also has some knobs: http://music.ashbysolutions.com/misc.html

It also has a description saying they should work if they are a certain size. I only have a crappy ruler lying around, but it seems to roughly be the same. But the ones in the picture don't look deep enough. My shaft is also not flat, it kind of comes up like 2 stems...I'll try to post pictures soon.

UPDATE: http://www.potentiometers.com/rns778.cfm?session_num=2006031707185416

Is the best I've see so far, it has detailed diagrams with measurements. But if you scroll down you can pick from two stem styles. "K" sort of looks like mine, but not. Mine looks like:

Otherwise, all the measurements seem to be fine, except for the opening where the stem is inserted.