Might be interested but you need to post if they are working and the model # . Some are no longer repairable. They may be worthwhile spares for my combo vacs if inexpensive enough.
I ditched photo eyes year ago for floor loop sensor and one floor stand loop. Less headaches. For a wheel eye you could go to a floor tape switch. Just keep a spare on hand .
I bought the X400 and needed to mount to a concrete surface which was an issue because it is not made for flush mount. The bottom protrudes upward. Found out make a collar / flange for this type of mounting. Perhaps that is how it can be mounted to combustible surface.
Follow Randy's advice. 10 minutes being careful not to damage the housing. Kind of Scary. Another incentive for Layered locks. Maybe add another 10 minutes if Randy is around:)
Before I would spend money on a retrofit kit I would try this https://www.jarvis-direct.com/products/400w-equal-forward-throw-79w-led-wall-pack-wmft-400
I think you can never be certain how the light will disburse for your application so you need to try it. I have one in an area and like it...
506 / 511 Hydrominder depending on whether you want the anti siphon. Keep one spare and few of the IN665K repair kits from Kleen rite. If one in operation needs a rebuild put on the spare, re build bad one and use the rebuild for the spare.
Don't know how much you weigh at a time but I bought a postal scale at Harbor freight to weigh out quarters in $100 increments for my cashiers. I use this set for grams.
https://www.harborfreight.com/digital-scale-95364.html
They also have one that goes to 70lbs but it measures in Kilograms...
FWIW I went to KR Low PH for my Pre soak, and HP Soap and Cherry Blossom forFB, and Kleen white for Tires, Just peachy for Wax. Saved a chunk of money over the name brands. Did not like their typical SS pre soak and HP. Had jelling issues with those. None with the Low PH I also use in the Tunnel.
FWIW I once had a pulse switch that had a little red light that went on every time the target passed it but was not sending the signal to the DRB. Had me fooled for a while.
That is one of the reasons I chose to ad a separate box for bills. Suffice it to say I an happy I did it and whatever time it takes to handle the additional collection point is off set by not dealing with lots of quarters. (or Dollar coins)