Have not mounted them yet, but they seem to be well made. No markings. Seems to be the same as other KP08 bearing blocks. Dimensions differ slightly among these on hole size, spacing and overall height.
I have included here (rounded) dimensions that I measured with my calipers--not the best tool for that purpose, but good enough for most things. Forgot to put in the overall width which is 2.17"(55). I did not include fillets and chamfers. Note that inner race protrudes on on side only, and is nearly flush on the other