Help finding helm seat footrest "spiders"

Hey all....
I just installed a gorgeous pair of Murray Brothers helm chairs with 4" stainless pedestals. I've been looking for a pair of footrests but holy cow, they start around $1,200 & surpass $4k each. Pompanette makes these but again, they are $1,800 each. I have a woodworking shop & can EASILY fabricate the footrest itself & I'm thinking dark mahogany with some blonde mahogany inlay but as easy as it sounds, I can't find the "spiders" to mount them.
I can't use the basic table mounts as the tops (though I could machine them out) have solid tops & spiders are open all the way through so they can slide up and down.
The actual spiders also come with nylon bushings so they won't scratch the stainless. I've found a few online but only for 2-7/8" pedestals.
Does anyone know who sells just the spiders without the footrest????

Thanks!
David

Thanks guys. Those site do have spiders which could be modified & used. I'll keep them as last resort. The Springfields are close (& very inexpensive) but still would need a bunch of work & I'd have to figure out how to make them readily adjustible. The one's I've seen in the past have a nice handle to lock them in place which I really need for when my kids take the wheel. I normally don't use the footrest (on my old seats) so they were constantly being listened and pushed to the side. This is SO **** frustrating. I know someone has them sitting on the shelf!! I'll try calling Bluewater on Monday. I guess I need to start calling all of the helm chair manufacturers & find someone willing to tell me who make the spiders for them.

Here's a good look at one. I've found several now but 4" spiders are a very elusive creature! This is from Pompanette & they do not sell them separately.