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Further to my OP, here's a picture of the 013 that shows the lower barrel without a flange or step, or alignment pin...
http://www.buyautoparts.com/buynow.asp?partnumber=49-00417&refno=0280212013&ref=oem&gclid=CjwKEAiAj-KiBRC48YzhnLSg0D0SJAClOhK3lTs63ZY4bLabAP8Y0tmQtQO5dadS77VOBSAhNyvZ1hoCxWvw_wcB
...and here's a picture that more clearly shows the 013 with the cast-in flange/step in the lower barrel. The OD below the step is the same as the OD of the original 019.
http://www.ebay.com/itm/Classic-Saab-900-9000-Mass-Air-Flow-Sensor-Air-Mass-Meter-0280212013/111399456432?_trksid=p4069.c100039.m2059&_trkparms=aid%3D111001%26algo%3DREC.SEED%26ao%3D1%26asc%3D20140107094819%26meid%3Da03a6db428db4ac5844a19abcf9e1c70%26pid%3D100039%26prg%3D20140107094819%26rk%3D2%26rkt%3D4%26sd%3D111480276422
posted by 98.227.3...
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