Stoptech's various street pads all kind of suck. Why not just buy something else?

But yes, Stoptech supply isn't great right now. It took me 6 months to get a pair of 380x35 rotor rings delivered this year, as an example. Not to mention the incredible price hikes on their BBKs. (Which are dumb. I can't see why you wouldn't buy something else at the prices they're now charging. I say this as someone with several Stoptech BBKs.)

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2011 M3
2006 Sierra 2500HD 4WD LBZ/Allison
2004 X5 3.0i 6MT
1995 M3 S50B32
1990 325is
1989 M3 S54B32

Hers:
1989 325iX
1996 911 Turbo