[ICOM] ICOM 7410 & its two filters

[John Hensley]

The new ICOM 7410 is listed as having open spots for two additional roofing filters.  I'm considering buying the transceiver now but the filters later.  My question is, has anyone bought this transceiver and installed filters themselves?   From the ICOM pictures, it looks like a small fine pin single row socket for each.  But I do not see an obvious keyway or position indicator.  
John W5JV