35 mm, for Sportster 1975-1983, FX 1976-1983 and FXR 1982-1983
There are two different standard lengths:
592 mm tubes on all XLH and XLCH 1975-1983, XLS and XLX 1983, and XLCR 1977, 642 mm on XLS 1979-1982, FXS 1977-1982, FXB and FXSB 1980-1983, and last but not least FXR 1982-1983.,
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