Arp 82 (NGC 2535 & 36)
Arp 82 is a member of the class Spirals with Large HSB Companions on Arms. NGC 2535 is the primary and NGC 2536 is the companion. Dr. Arp's Atlas note says "arm opposite comp. is extremely long". That shows clearly in the negative image.
Atlas Image
10-inch Newtonian, StarlightXpress MX716, 46 minutes