I'm about to mount a set of TACO horizontal rod holders (made out of Starboard) in my '71/72 170. I have a pair of two-rod and a pair of three-rod holders and both fit in the space, but the in-wall openings on my boat, which look like yours but have that white, textured plastic-coated-metal trim material on the edges (anyone have a cheap source for that trim material? I need about 7 feet of it to trim the anchor locker as well as the toe rail and radio access areas on the helm...) look like they may be a bit narrower than yours from top to bottom. When I temporarily placed the two sizes of racks in the compartments to test for location, I found that there really isn't enough room height-wise to comfortably fit three rods and reels in the three-rung holder though. The rack fit but the uppermost rungs for rods was not fully accessible -- at least at the end of the in-wall opening that was smaller height-wise than the other. I may stick with the two-rung rack on one side and see how that works. It also appears that the compartments are not 'deep' enough width-wise to keep the reel handles from jutting out where you can bang your legs on/break them as you walk by. My 170 doesn't appear to have ever had rod racks in either side, which seems like a waste of space -- but the dimensions of the in-wall compartments may be why. Were in-wall rod racks an option on the 170?