 The reg is listed in the parts section .. I found it looking under an 800 tractor... it is the 3rd from the last item in the link I provided. I am *assuming* you have a 6v gas model.. and not the 12v diesel model. if you have the diesel.. look at the item above the 6v reg. The 800 used a B circuit genny and regulator. the reg for it is the same from a NAA, or any o fthe gas 6v 00, or 01 series tractors, as well as the 4 cyl 2000 / 4000. The stud on the end case is the armature. the 2 small studs on the barrel are field and ground. One of them will have an obvious insulation grommet or phenolic insulating washer at it's base.. the other will be more or less screwed/pressed right to the case. Soundguy Voltage Regulator, 6 Volt - 6 volt positive ground for 1953-1964 GAS engine tractors: NAA, Jubilee, 1800, 600, 620, 630, 640, 650, 660, 601, 611, 621, 631, 641, 651, 661, 671, 681, 700, 740, 750, 701, 741, 771, 800, 820, 840, 801, 811, 821, 841, 851, 861, 871, 881, 900, 950, 960, 901, 941, 951, 961, 971, 981, (Part No: FAG10505A) $26.71
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