COMMISSION REGULATION (EEC) No 2658/93 of 29 September 1993 amending Regulation (EEC) No 584/92 laying down detailed rules for the application to milk and milk products of the arrangements provided for in the Interim Agreements between the Community and the Republic of Poland, the Republic of Hungary and the Czech and Slovak Federal Republic and Regulation (EEC) No 2357/93 determining the quantities of certain categories of milk and milk products available for the fourth quarter of 1993 under the arrangements provided for in the Interim Agreements