Ah so your the guy who bought it on ebay for that killer buy it now price. It's a great machine, I have a durst pro that is basically the same machine that was made for a short time a few years after yours and is all black. There is a 6x9 holder, I have one. It's called a camneg 69 or 690. there is also a glass film holder which I have been looking for a long time but hasn't popped up. That would be ideal for 6x9 and 4x5 but negs in the regular holders still print well. You can easily make one from some thick card stock with the addition two half moons on the bottom to keep it steady and rotateable.
I went the cheap route and just use thin filters I hand hold under the lens. I could not find a suitable holder nor did I find filters that were big enough to put into the head where condensers were inexpensively. I use a combination of 100watt and 150 watt bulbs. I can't check the exact number now but will tonight after thanksgiving when I get back home. They were not expensive at all like $1-2 each in bulk. The 150watt has a run time of like 3 hrs from manufacturer. The back of the head had a nifty adjustment for bulbs allowing you to move the bulb closer or farther away from condensers as well and position it horizontally forward or back in the head so you will need to fine tune it at first for the bulb size and wattage to get an even illumination.
Sorry my memory is slipping a bit. The bulbs are actually 150w and 250w. It's the 250watt bulb that has the very short life span.
The 250w is a ph213 and the 150w is a ph212.
I got them from 1000bulbs.com online for about $1 each looking at my old emails. The same site also sells the Thomas Duplex sox35 bulb for about $36 or so, great deal vs buying the $100 version from the manufacturer.
You can use smaller bulbs if printing at smaller sizes so exposure times are not crazy short which also lets you not close down the lens aperture all the way and add diffraction to the mix.
The bigger wattage bulbs help a lot with big prints but gets hot quickly.