The bypass hose You're going to look at is about 1.5" or so if it's a low-deck "G"170, about 3" for the tall-deck "RG"225 & 198. The difference in deck ht. is approx. 1&5/8". From the photo it appears to be a 225, & depending on the vintage, there will be either a "17" or "22" for mid 60's & down, or the actual 170/198/225 on the deck pad next to the alt bracket.............................
