You should get these easy enough on most reasonable 6013s if you are there or thereabouts in terms of polarity and amperage.
This was DC electrode negative and about 117-120 amps with a fairly flattering Lincoln Gricon 33.
well I did pick up a IFL inverter second hand at a very good price, so far just tested it, must admit very easy compared to buzz box, well getting it started anyways! will give it a proper go when I get the chance.
Yep peelers aren't difficult to achieve on flat butt work or vertical butts. I'm close to going as far as to say that if they aren't happening things aren't quite right.