d04271r:  backs with standard frame 31

d04271r1467	d04271r1468	d04271r1469	d04271r1470	d04271r1471	d04271r1539b
d04271r2522a	d04271r2522b	d04633r70	d02489r459	d04271r3067	d04271r3139
					d04271r3189

variant:

d04271r1539