Ioptron CEM120 mounting plate - bolt lengths

[SteveA]

I'm in the process of modifying my home built pier to accept a CEM120 mount. I've not ordered the mount yet and consequently don't have all the dimensions I need. I've got the overall dimensions of the base and the location of the M8 fixing bolts. What I don't know is the length of these bolts, ie.  how far they protrude beyond the mount base. I've yet to decide if I try and tap M8 threads in the aluminium  base I'm constructing or alternatively just drill straight through my base and secure the bolts with nuts. The second option is undoubtedly easier, but I do like making life difficult for myself.  Knowing the length of the fixing bolts would be helpful. 

Steve

[SteveA]

Its a sad state of affairs, but just for completeness here I go answering my own question.

Having now picked up a new CEM120 from FLO last week and I can answer the question with some authority!

The bolts are 22mm long.

Less than I thought they would to be honest!

Steve