I have a Philips enlarger, bought used many years ago. It is a well made piece of equipment, made in japan, presumably for, rather than by Philips.
With regard to negative holders, assuming the enlarger is similar to mine, various sizes were available to fit the carrier. The usual 35mm strip, 645 and 6x6 masks and also a 35mm slide carrier were all available, but I would imagine will be hard to find now. I had to order mine from Jessops, when they were worth patronising, and they took a while to arrive. I seem to remember Paterson were the distributor in the UK. The lamp used was a standard 150 watt ES enlarger type.
The lens mount has two positions, the position for smaller negatives holds the lens closer to the film, for larger formats, further away. For work with 120 films there was a larger condenser, that supplied with the machine being for 35mm etc. The model is PCS 130.