seeing your pic, i just remember, that then, the seller told me, he didn't have the exactly same parts, but that those shown above (under "AT LAST!!!! ") should do the job.
and they did. for six years, till a move caused dismantling of the layout.
i did not include the diodes into the homemade 1700s. i just screwed or soldered one (in the desired direction) to the outlet of the reeds. (saving a lot of work on more than a dozen reeds!)
ah, something else. the size of the reeds did not make any difference. what did, was the number of switch motors served by one reed. those serving two or three switchmotors did burn closed sometimes.
i think, i will shamelessly steal your idea to use plastic sleepers. (for the more than 20 reed contacts i'm going to use, that will save a lot of work)
btw: if i ever will update/rewrite that page of my website - may i use your photo above?