BSS FSC996 replacement fader

hi I'm trying to find some replacement faders for a bss fcs966 . a few of them had broken off knobs what i should have done is glued a piece of metal in there for a knob to sit on instead I tried to take one apart to see if it the glue idea would work . now I can't put it back together and can't find a replacement online . it has four pine while most I find have three . anybody know where I should be looking please . learned a lesson anyway check availability of parts before buying or taking parts apart incase you can't get them back together again .
thanks
 

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Perhaps there are two common points like this one.
Fader.jpg

Should be easy to measure with an ohmmeter.
I checked proaudioparts, they don't have 50k linear faders like the one you need.
You might find something at Ebay but the quality is never guaranteed.

Hugo
 
they're marked 1234 thank-you for looking I really like the odea of picking things up bit cheaper that need the odd repair but I think I've dropped the ball here . wad only 35quid so not the end of the world but still a shame