Hi Jimi, I really enjoy these discordant redshift pairs too, but of the three objects above I only have one observation of NGC 7603 from December 2009. It really isn't much but here are my notes and sketch:

"This was considerably fainter than I expected but star hopping got me to the same galaxy twice and the photo in the Arp book confirms I got the right faint galaxy - and companion! At mag 16.8 that's pretty good in these less than perfect viewing conditions. 7603 needs a darker, steadier sky but both objects are there, with "B" needing only casual averted vision to pop out. 253x and 408x, SQM 21.07."

Arp92_N7603_crop.jpg Arp92_N7603_crop_invert.jpg