like these?
https://www.ebay.de/itm/371088397842?hash=ite … zQAAOxye3BRvbOw
just having a hard time to find a 66Mhz version.

Yes, that crystal will do for a 50 MHz bus. For the socket, you will do better getting one with round pins, as that'll work better with the round pins on the crystals. I think the pins are easier to remove as well. https://www.ebay.co.uk/itm/114815321251 has the type you need for round pins at a good price

https://www.ebay.co.uk/itm/284189654948 has the right 66MHz crystals, but not cheap

Just found https://www.ebay.co.uk/itm/292123966688 which is much cheaper. If they don't ship to your country, I'd be willing to have one shipped here, and forward it to you.

Edit:

Just noticed the seller sells them in lots of 10. I'll be buying 10 at the end of the month. I only need a few. Have PMed you offering one at cost if you need it - that's £0.59 for one.

100MHz or 66Mhu depends on the cpu i gonna use. i do have DX50, DX2-66 and DX4-100 (AMD).. most likely i would decide between the dx2-66 or dx-50.
I guess having both crystals at home to play around would not be a bad idea .. who knows which old board will cross my path in the future 😁

soo. thanks for your offer debs3759. I managed to find 66Mhz (new) in germany. bit more expensive (around 2€ each) but with less hazzle for you and less shipping costs 😀
i ordered 66Mhz and 80Mhz (for a potential DX40). also 100Mhz from china as well as the round socket.

i will post some pics/updates when the parts finally arrived.

now i need to hunt for a non-glued CPU Cooler. damn they are quite rare and expensive 😁

Just look out for something like this more locally, https://www.allelectronics.com/item/hs-587/40 … heatsink/1.html the mounting mechanisms on most 486 sinks are getting brittle with age, so you may have to figure out your own mounting eventually anyway.

... and this sounds primitive, but might get you running, I'd think of making small loops of fishing line to hook over opposite corners of the CPU and onto the corners of the heatsink, twisted tight with half a match-stick or similar, then trap the match-stick between fins to stop it unwinding.

edit: oh neat they have a 40mm fan in too, https://www.allelectronics.com/item/cf-466/12 … ling-fan/1.html not that a sink that size would need one with a moderately ventilated case, but if you wanna overclock DX4s that would be the one to stick on it. (Or maybe for really shallow 5mm high heatsinks on DX2 up)

i found some Heatsinks at a shop for a reasonable price by now. they were around 17€ each which is ok for now. Also i do have the issue that i cannot place huge heatsings where the cpu is, needs to be pretty flat as the Floppy drive sits above. will see how it works out 😀
i should have ordered a 50Mhz too for the dx4 though -.-

Yeah I guess that's "fair", new generic type heatsinks would be in the 10-20 range back in the day.

So. here are the pics of my little project.