OOZE is a reread please. Black round heads need the short neck bulb, the grey oblong can take the common long neck bulb.
I got Newton rings all the time. You need the AN "filter" that clips under the condenser. These cost as much as the enlarger.
Grey heads have a filter opening, but not necessarily the hardware to make them work ( there needs to be a rod out the right side). I made a filter carrier to go into the opening. You can also lay a filter over the condenser.
The original Focotar lens is optimized for 5x. 8x10 starts getting poor. There is a large front element Focotar lens and the Focotar 2 which are much superior.
Get more info on it before you buy.