Have you run through the list of Chandleries, & Boat/Boat Gear Salvage
Shops, which specialize in used marine gear
? As there are more than enough of them out there, to fill up many, many pages in a phone
I'd start with the big name places, & work my way down. And when you speak with them, ask'em if they'd be kind enough to give you a call when they get some matching ones in. After leaving a few pics, plus a phone
number with them.
Plus, perhaps offering them an incentive/finder's fee, if they set you up with your ideal choice, gear wise.
Also, some other possible options are:
- Get (all) of your current
ones re-welded/refurbished (& beefed up), now. So that they're all the same, cosmetically, as well as meeting the same standard, strength wise.
- Get a full set of new (pre-loved) ones (plus a few spares @ the same time). Particularly as, usually you can do something like that at enough of a discount (by buying
used, in bulk) that it wont hurt the wallet too badly. Especially if you sell the old ones at the same time.
- Consider beefing up your lifeline system in the areas where the old bases are failing/have failed. Most likely due to their bearing extra loadings over time, as compared to the others.
Which may mean having a few custom stanchions/gates, with more & beefier bases, made. Including the use of oversized, welded gussets, as well as oversized lugs (such as are found on older racing
bike frames). And or, bolting extra supporting hardware
onto the stanchions themselves.
: When I say lugs, I'm referring to ones akin to these, bicycle frame lugs - Bing images
though they needn't be so complex, or "modern art'ish".
Still the purpose is the same: To strengthen the structure, via adding extra metal in the high load areas. Without creating hard spots, through their use of non-linear end points in their design shapes, where the lugs terminate on the tubing.
There's also, one other possible option. But it's a lengthy read. And semi-complex, plus expensive to do. But if you're curious, just LMK.