There were probably a couple of versions of E25 spreaders and brackets produced over the years, so a photo would be helpful.
My '69 32 has cast aluminum brackets that are presumably original and still in good shape, and wood spreaders made of Sitka spruce that have rotted and been replaced at least once, by me. The spreaders are actually a very simple wedge shape. I had a friend show me how to use a planer to turn the ugly slab of old-looking, expensive wood I was sold into a beautiful board of the correct thickness. I cut them out (two each of two different sizes) using a basic band saw and then touched up the edges with a router. A bunch of holes with a hand drill, some sealing epoxy and good paint, and I expect them to last at least another decade.
Off-the-shelf replacements for brackets and/or spreaders are worth looking into but a less-than-exact fit might end up cascading into a whole bunch of other parts that need to be replaced to maintain the correct geometry. (Although, with a single set of spreaders, perhaps this wouldn't be so bad...?) You could probably get a shop to weld you up a custom stainless of stainless or aluminum brackets that match your existing brackets and enable you to copy your existing spreaders (in wood or aluminum) and get back on the water more quickly and inexpensively.