Zahnrad, I have lots of the aluminum way wipe covers, but none made of cast iron. That despite having parted out two round dial machines over the years. Those seem to be the parts that first disappear.
While on the topic, you probably already know this, but the small piece on the bottom of the vee way wipe cover, that is missing, is not hard to make if you have another to copy. It has a slot to hold a small felt wipe that keeps the bottom side of the bed clean in line with the ball bearing gibs, so the carriage doesn't get jammed by chips. I doubt that there are many still serving that purpose effectively, since once the lathe bed or cross slide wear or get reground, the dimension from Vee-way top to bottom decreases. How many rebuilders decrease the height of the v-way cover when the bed gets reground? Also, that felt wiper is often missing or worn down to nothing on lathes I have worked on over the years.
-Dave