"Since the toner was coming onto the green roller in a stripe"
The green roller is the selenium transfer drum which holds the charge - and the image
Its worn out
You mentioned in a previous post that you cleaned it - thats probably damaged the roller even further. Just touching those things damages them. Believe me I've been there and tried it
From memory I think the transfer drum and fuser unit are integral on these, though I suggest you call one of the specialist spares suppliers. From checking the web it looks as it new units are no longer in production - you're faced with buying reconditioned one
for instance, try calling this company (you'll find many others)
HP Fuser for LaserJet 4+ & 4M+, and LaserJet 5, 5M, 5N