Constanza Kit (http://www.scalemates.com/companies/company.php?id=2587) has just released 1/72nd Slingsby T-67M/T-3A Firefly Mk.II resin kits.
ref.CON807206 - Slingsby T-67M Firefly Mk.II
Source: http://www.aviationmegastore.com/slingsby-t67m-firefly-mkii--con807206-constanza-kits-con807206-netherlands-military/product/?shopid=LM5437f81d922e6648aeb9de84a9&action=prodinfo&parent_id=212&art=125437
ref.CON807207 - Slingsby T67M-260 Firefly T-3A (USAF)
Source: http://www.aviationmegastore.com/slingsby-t67m-260-firefly-t-3a-usaf-con807207-constanza-kits-con807207-scale-modelling/product/?shopid=LM5437f81d922e6648aeb9de84a9&action=prodinfo&parent_id=212&art=125439
V.P.