I am looking to purchase a set of Navnet vx2 screens, a 10.4" & 7" from someone who recently upgraded. The radome he is including in the package is a 24", which is much too large for the mast on my boat. Can someone tell me which Furuno radomes are compatible in an 18" diameter? I found a used RSB 0087, R070 but I have not been able to determine if it would work with the vx2 system.