The M88 was not fielded until 1961, so it may be too late for the time period you are looking for. The two more likely vehicles would have been either the M74 ARV or M51 ARV. Both are only available as resin kits, both from Perfect Scale Modelbau out of Germany.
M51: www.perthmilitarymodelling.com/.../psm35016.html
M74: www.perthmilitarymodelling.com/.../psm35012.html
If you are looking for later in the '60s and the M88 would work, you want the Vietnam M88 version by AFV Club.
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