to fit serial nos.:
1068010026, 1068010028, 1068010039, 1068010043, 1068010044,
1068010045, 1068010046, 1068010051, 1068010052, 1068010053,
1068010054, 1068010057, 1068010059, 1068010062, 1068010063,
1068010064, 1068010065, 1068010066, 1068010067, 1068010069
1068010070, 1068010071, 1068010073, 1068010074, 1068010075,
1068010076, 1068010077, 1068010078, 1068010079, 1068010082,
1068010083, 1068010084, 1068010085, 1068010086, 1068010091,
1068010092, 1068010093, 1068010094, 1068010095, 1068010096,
1068010097, 1068010098, 1068010100, 1068010101, 1068010102,
1068010103, 1068010104, 1068010105, 1068010106, 1068010113,
1068010114, 1068010115, 1068010116, 1068010117, 1068010118,
1068010119, 1068010128, 1068010129, 1068010138, 1068010160,
1068010179,
1068020002, 1068020003, 1068020004, 1068020011, 1068020014,
1068020018, 1068020020, 1068020027, 1068020029, 1068020030,
1068020033, 1068020034, 1068020035, 1068020036, 1068030037,
1068020038, 1068020043, 1068020044, 1068020045, 1068020046,
1068020047, 1068020051, 1068020054, 1068020057, 1068020064,
1068020065, 1068020066, 1068020076,
1068030017, 1068030018, 1068030024, 1068030027, 1068030029,
1068030030, 1068030031, 1068030032, 1068030033, 1068030035,
1068030036, 1068030037, 1068030038, 1068030043, 1068030044,
1068030048, 1068030049, 1068030060, 1068030061, 1068030063,
1068030067
(list might now be complete)

6HP26, 6HP26A