Fuel Sending Unit Length?

[Gator_Bait]

My sending unit is bad and I am going to replace with a vertical float type and was wondering if anyone knew off hand the length needed for the 60 gallon tanks? It's a 1994 V21 if that matters and the tank appears to be glass or poly, def not metal.

Boater's World has a 10" and 12" in stock and I was hoping that if I knew now that it is different than that, I could pre-order prior to removing the old.

thanks for any insight...otherwise I'll just pull it and stick a tape down in the tank
;D

Scott