I found a source for the grey and black piping Mesa uses on their current cabs:
http://www.garysupholstery.com/weltcord-premade.html
The black is identical to Mesa's - I just redid a 4x12 to match a newer one.
I *think* the match for the grey is the "charcoal" - the "grey" looks too light to me.
Anyway, it's cheap - less than $8 to do a 4x12 (less shipping), and the delivery was very fast.
http://www.garysupholstery.com/weltcord-premade.html
The black is identical to Mesa's - I just redid a 4x12 to match a newer one.
I *think* the match for the grey is the "charcoal" - the "grey" looks too light to me.
Anyway, it's cheap - less than $8 to do a 4x12 (less shipping), and the delivery was very fast.