Hello Csaba,
1) With your Hp-41CV, you already have the full possible amount of conventional RAM (ie 319 registers). The other modules you mention are ROM/System modules which map to a different address space.
The 82106 modules cannot be used with the CV and were solely designed to bring a normal Hp-41C up to the capacity of your Hp-41CV.
Your only choices are now either sell them to an Hp-41C owner or donate/trade them with Diego Diaz at Clonix, who uses the shells to manufacture super Rom/Ram modules.
2) That being said, you may extend your Hp-41CV memory by using the Extended Functions/Memory module that will provide you with memory you can save/load your programs from/to.
3) Or better, when you get used and appreciate your 41, have a look to Diego's modules at the link above or Meindert's solution at: MLDL 2000
These 2 solutions are the best I know to extend your Hp-41 possibilities in a flexible and reliable way.
Cheers from France!
Etienne