This is the standard Meade adjustable wedge. This one came from my 10” SCT, and I think it fits all the 10” LX-3, LX-5, etc. The wedge has been well cared-for and is in good condition.
The base (~6-1/2” diameter) of the wedge has a central hole (~ 1/2” diameter), and 3 holes that form an equilateral-triangle (~4-1/2” on each side). This fits the standard Meade field tripod.
The upper plate (~8” in diameter) has 3 holes that allow the base of the SCT fork mount to be attached. The 3 holes form an isosceles-triangle: the base ~6-1/2” and the two long sides are ~6-3/4”. This is the standard Meade fork-mount pattern.
I’m asking $120 + actual shipping (probably about $15 ConUS)