Replacing Hurd casement split arm operators

I am needing to replace a number of left and right hand Hurd casement operators. I ordered from Hurd last year and they replaced with Truth hardware. I see you handle Truth. I have attached photos of the left hand Truth replacement , and of a left and right hand Hurd operators that are on my windows. I am having trouble matching model numbers. Photos of products don't appear to exactly match. I think I have it narrowed down , but want to see what you advise. As I will need a number of units. # on Hurd unit 7702 and 07900 on split arm , and 45251 on Truth unit 21550 on the split arm . Thanks Larry