I use the same rule a micro-pitch devices. If the lead spacing is  .5mm (.01968) or less, it gets fiducial(s).
Check w/ your assy house to see what they want / can do.

Michael Kuczynski                             Sr. Designer/Librarian
Philips Components                          LCOS Project
345 Scarborough Rd.                       1-914-945-6346 (Ph) 
Briarcliff Manor, NY 10510-2099    1-914-945-6798 (Fax)
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