I brought second-hand ex-1 mars with RF-101F and kr-297fz receiver. Recently, I get another kr-297fz without crystal. So, I want to find some crystal to make it work. But I am confused with which frequency I should chose. My ex-1 comes with 27Mhz crystal, but can I plug in 75mhz crystal in both module and receiver to make it work?

And can I plug RF-501F which designed for ex-10 in my ex-1 mars? Does anyone have a compatibility list for ex-1 mars?

Thanks