srs5694, your surmise about my info is correct. I don't have any info on the Paterson versions of these enlargers at hand.
I am also keeping an eye out for the 6x7 condensers. I used to sell these enlargers (Philips branded) in the US, and I always tried to get the purchaser to get the extra condensers from the start. Not many did, and I'm sure other shops and staff didn't push for that preemptive purchase as I did, so I'm certain not many were sold. I recently got my PCS 150/130 from a generous APUGer, having used only the head and controller in an adapter for an Omega D5 starting in the 1980's.
I think I've posted this before on APUG, but the two condensers needed for 6x7 are the F135 on bottom and the F160 on top. Both are listed as accessories, not supplied with the enlarger. Stock configuration was an F91 on bottom and an F145 on top. 4x4 and 6x6 suggestions are an F135 on bottom and an F145 on top. So if you have the F91 and F145 standard configuration, you'll need two additional condensers to get to 6x7.
Lee