From the OK ENGINES NEWSLETTER:

"We will be re-introducing (with minor changes) our line of R series engines in 2007. This is a rear intake, reed valve engine which debuted in 1958 and was discontinued in 1964.
three models will be available in mid-april in  quantities of less than 500 each. All engines packaged NIB in vinyl box with instructions.

OK CUB .049R   Opaque tank, glow plug version   $35.95

OK CUB .06R    Opaque tank, glow plug version    $39.95

OK CUB .049BR No tank, aluminum intake, glow plug $39.95"

Larry

I will be stocking the .049 engines as all of the .06 engines are sold out.
Larry