OP is talking about PUSH/PUSH pots.
I wanted some a couple years ago and was disappointed that there were almost no choices. I bought cheap ones from Amazon. They are definitely not high quality. They don't sound bad, but they are not robustly made, and there is no smoothness to them when you turn them.
I had an old Japanese Yamaha guitar that came stock with push/push pots, and those things still worked and felt great even after 35 years.
I’m actually looking into building a Push/ Push harness myself currently so you‘re in luck as I’ve done all the research already. It’s really down to 2 choices. Gibson used Alpha pots in the Traditionals a few years back that they did push/push set ups in and they are as other said low friction with turning. But there is just something cool about the Push/Push for me over a Push/Pull. You can buy the 500k Alpha pots from Mojotone as I did. I also bought another set off ebay that looked like they might be slightly better build quality with brass shaft and bushings. They are also higher torque for turning. I have not decided yet which ones I will use for the build But I’m leaning towards the pots I got from ebay because like I said they look and feel like they are better built than the Alpha pots. I’m also adding a Shadow kill pot in one of the tone positions. Here is the link for the ebay pots I got
https://www.ebay.com/itm/1237116683...KbSwQXwSim&var=&widget_ver=artemis&media=COPY
And the link for the Alpha pots from Mojotone
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Mojotone 500K Audio Taper Push-Push Long Shaft Guitar Potentiometer
3/8'' diameter x 5/8 long brass bushing. US spec threads and a 24-Knurl Split Shaft. Cavity depth needed to accommodate switch and pot is 1-5/64" or 1.108"www.mojotone.com