for lack of time to look for hnbr type, i used my available o-rings albeit not fully recommended. i will be sending my car to aircon shop for freon charging with hope that what i did would last at least a year....

meanwhile, i hope someone could direct me to local a/c parts suppliers preferably in manila with available hnbr o-ring, as well as tools and equipment needed in auto ac repair/maintenance. cheers..