Serpentine belt, V70 - T6, Differences?

[Faust]

As you can see from my other posts, I took the forums advice and replaced the alternator with a failed pulley, with a used alternator from a '04 S80 T6. Hollanders said they were the same. Well, I got the V70 one out, and the T6 one in in about 2 hours (10 minutes on my '64 Plymouth convert). It all went together as it should I have been struggling, off and on, for two days to get the new belt I purchased on. That is a Dayco for the V70 6060719. A few minutes ago I thought to check if the T6 used the same belt. It doesn't, the T6 uses a Dayco 6060724. I don't know how to decode Dayco belt numbers, but I suspect that the 719 and 724, indicate a slight difference in length. The only difference I can imagine is the size of the pulley on the T6 alternator. I just checked an online supplier and they list different numbers for the V70 pulley and the S80 T6 pulley. Looks to me that I am in the market for a T6 belt. Anyone know for sure? Can anyone decode the Dayco numbers (they should indicate length)?

[Faust]

Well, I got out this morning and put my mic on the two pulleys (pretty awkward with the installed T6). I get a larger diameter on the T6 pulley of about 3mm. The differences in the Dayco belts is 719 = 71.85", 724 = 72.44". That seems to solve the Dayco "code", drop the decimal point and use the first three digits for inside length. I guess it is time to to try the Dayco 6060724. Surprisingly, that is 50% more than the 6060719. Any better ideas?

[abscate]

I could tell you a better idea, but you will have to give me your soul.

[Faust]

I could tell you a better idea, but you will have to give me your soul.

“There are but two roads that lead to an important goal and to the doing of great things: strength and perseverance. Strength is the lot of but a few privileged men; but austere perseverance, harsh and continuous, may be employed by the smallest of us and rarely fails of its purpose, for its silent power grows irresistibly greater with time.”
Faust: First Part

[abscate]

Try Dayco belt 666-666

It will fit. Just try it. Come on...

[Faust]

Try Dayco belt 666-666
"And the smoke of their torment ascendeth up for ever and ever: and they have no rest day nor night, who worship the beast and his image, and whosoever receiveth the mark of his name or his number." - Revelations, KJ version

Seriously, I got the belt spec'd for the T6, Dayco 6060724. It went on just like the show and tell videos on Youtube.