Thanks Dan.  Found it, the Citizen part number is HC49US50.000MABJ.
Think this is also 3rd OT from their website.
http://www.citizencrystal.com/quartz/crystals/hc49_d.htm

Manage to get some 3rd OT, will try it out and inform all later.

Cheers, Ling
.....
>4. Digikey shows Citizen xtals at 50 in the latest catalog - check
>this is SMT
.....

Digikey cat Q002, Apr-Jun 2000, pg 259, bottom right,
P/N 300-6060, 50 Mhz
----------> thru-hole.

Also, since Fox was 3rd OT, this needs checking too.