The lightest, cheapest and most secure mounting is to fit a dovetail bar using the existing holes.
The HEQ5 is more robust and has a greater load capacity than the EQ5.
Both mounts use a narrow dovetail described as V, Vixen or CG-5. There are numerous manufacturers: ADM, Losmndy, Farpoint, Celestron, etc.
Genuine Celestron CG-5 dovetail bars are a spare part but hard to get new. Can find on eBay from sellers who have swaped over to the larger size.
The wider dovetail is the D, Losmandy or CGE and is produced by many manufacturers.
The genuine Celestron CGE bar is easy to find, does not use curved spacers like the other brands, and is also just a little narrower so that it will not clamp securely in an ADM saddle.
The NEQ6pro is a much stronger mount. It can take either V or D dovetail bars. The older EQ6 takes only V.
Personally I would opt for a wide dovetail and NEQ6pro.
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