no strictly 571 forks, mainly ones made for 630, 622 & 590:
Claud Butler 531 fork with m5 threaded mudguard eyelet, 1" x 148.5mm threaded steerer, c-c 375mm- £20;
unbranded alu fork with untapped mudguard eyelet, 1" x 142mm threaded steel steerer, c-c: 385mm - £25;
Dawes lugged crown steel fork with m5 threaded mudguard eyelet, 1" x 140mm threaded <lots!] steerer, c-c: 375mm- £15;
Dawes lugged crown steel fork with untapped mudguard eyelet, & drive side mid-leg light bracket boss, 1" x 168mm threaded steerer, c-c: 390mm- £15;
Peugeot lugged crown steel fork with mudguard t-nut eyelet, 1" x 243mm [again, long threaded section], c-c: 377.5mm- £10;
heavily constructed, unbranded lugged crown steel fork with m5 threaded mudguard eyelet & high front carrier mounts, 1" x 165mm, c-c: 392.5mm- £15;
unbranded steel fork with m5 threaded mudguard eyelets, drum brake torque arm location sleeve inside left leg, cable routing sleeve on back of left leg & dynamo mounting arm on front of right leg, 1" x 178mm threaded steerer, c-c: 405mm- £15;
unbranded steel fork with front & rear m5 threaded eyelets- suitable for a front carrier, cantilever bosses for use with 622 rim, 1" x 178mm threadless steerer- £10.
no strictly 571 forks, mainly ones made for 630, 622 & 590:
Claud Butler 531 fork with m5 threaded mudguard eyelet, 1" x 148.5mm threaded steerer, c-c 375mm- £20;
unbranded alu fork with untapped mudguard eyelet, 1" x 142mm threaded steel steerer, c-c: 385mm - £25;
Dawes lugged crown steel fork with m5 threaded mudguard eyelet, 1" x 140mm threaded <lots!] steerer, c-c: 375mm- £15;
Dawes lugged crown steel fork with untapped mudguard eyelet, & drive side mid-leg light bracket boss, 1" x 168mm threaded steerer, c-c: 390mm- £15;
Peugeot lugged crown steel fork with mudguard t-nut eyelet, 1" x 243mm [again, long threaded section], c-c: 377.5mm- £10;
heavily constructed, unbranded lugged crown steel fork with m5 threaded mudguard eyelet & high front carrier mounts, 1" x 165mm, c-c: 392.5mm- £15;
unbranded steel fork with m5 threaded mudguard eyelets, drum brake torque arm location sleeve inside left leg, cable routing sleeve on back of left leg & dynamo mounting arm on front of right leg, 1" x 178mm threaded steerer, c-c: 405mm- £15;
unbranded steel fork with front & rear m5 threaded eyelets- suitable for a front carrier, cantilever bosses for use with 622 rim, 1" x 178mm threadless steerer- £10.