These trays are designed to work with the OEM fiberglass radio box. They can also be used with many other tunnel radio boxes, with some slight modifications. The width of these trays is 2.60". I have come up with what seems to be the most common servo layout. These cutouts are for MOST standard sized servos. Some servos will not fit without modifications.
These trays are made out of black Delrin (Acetal), a very strong, light and chemical resistant material. The mounting holes for the servos are simple 0.060" through holes and can be drilled and tapped for whatever fastener you decide to use. (I prefer 4-40). I typically mount these trays from the side with 4 screws through the side of the radio box, but they could also be mounted from the top down onto rails that are epoxied inside the box.
Version 1 (V1) is designed for (1) 1/4 scale servo, and (2) mini servos, such as the Hitec HS755 and Hitec HS85MG
Version 2 (V2) is designed for (1) 1/4 scale servo, and (2) standard size servos.
Version 3 (V3) is designed for up to (4) standard servos
Version 4 (V4) is designed for (2) standard servos and (2) mini servos.
Be sure to choose which version you want before adding it to the cart.