How to patch SuSE RPM Packages ?

Hello list ? I have got some SuSE 7.3 boxes. Now I want to upgrade the latest openssl packages from version 0.9.6b Release 158 to eg. 0.9.6e . Newer packages are not offered by YOU. Which other possibilities exist to upgrade the packages except building them form tarballs ? Can I use the source rpm´s offered on suse´s website ? Thank you for your help ! Stefan