The feet for my White 77 Rotary are almost exactly 7/16" high from the bottom of the foot to the top of the prongs. But measuring several of the feet, that can vary from a little over 3/8" to 1/2". And those are the original attachments. I know it's a different model but I'm pretty sure that the style of the feet are alike 'cause I have a straight stitch foot from a MUCH older White (before they made hinged feet) & the hinged foot that's original to my 77...& they fit the same.
Domestic & Kenmore rotary feet will also fit but most other ones won't & it's not the height. It's the needle position. If you notice, the straight stitch foot you're using, the needle is about 1/8" in front of the back of the slot. With a White foot, the needle is about 1/32" from the back. That's OK with your straight stitch foot but when it's a hemmer, ruffler. etc, the needle misses the hole by about 1/8"!
If you're looking online, the White, Kenmore, Domestic feet are pretty easy to recognize. The prongs/toes are usually longer than other types.