D7 7M Water Pump packing

I wouldn,t think the size would matter too much as long as you get the cavity full around the shaft & tighten up the nut to compact it around the shaft.The Cat packing had a coating of graphite I believe it is on the cord.

I don,t think it would matter too much but if I recall the regular Cat packing is one piece but is split around the cord in places but the graphite tends to hold it together. Doesn,t Cat have the seals anymore? If I recall the older D7 & D8s had the same packing in them. This is just my idea but if the cord you get is just plain cord with no coating of any type on it maybe soak it for a little while in water then it would pack tighter.Don,t over tighten the adjusting nut first but you may have to take it up a little more after the engine is run for a little while to correct any seepage out of it.