Need crossbar feet for T Channel setup

Picked up a used topper off of FB Marketplace and it only came with one crossbar. Looking to either match or just replace with a new set but don't want to go overboard on price. Just really need some towers or feet to fit in the T-Channels but not sure if something like these https://www.rei.com/product/225464/yakima-tracktowers-set-of-4?sku=2254640001&store=&CAWELAID=120217890016358782&CAGPSPN=pla&CAAGID=101991076723&CATCI=pla-317637249591&cm_mmc=PLA_Google|21700000001700551_2254640001|92700054789804083|NB|71700000066691793&gad_source=1&gclid=CjwKCAjwi_exBhA8EiwA_kU1MpfW8-1DsqAjnWIsdhsd2-IEEFk4GJWTs7W99kdRXHutbEYAWaxZlhoCP8UQAvD_BwE&gclsrc=aw.ds will fit on not, or are there other alternatives for this?

Any suggestions?

No RTT or anything crazy up there. Was thinking of a basket and a fly rod holder.

 

It looks like its off a 4runner. When I built my first shell rack system I used the same crossbars.