I measured mine - yours should between 453 - 456 mm long. I must say the wider bars were a lot more stable than the thinner dovetails and the Losmandy D dovetails were even far more rigid.
I bought my Losmandy D dovetails from Bintel in Glebe Sydney
www.bintel.com.au
You probably want this
http://www.bintel.com.au/Accessories...oductview.aspx
Measure carefully and call them - they list both the old and new style plates - there is about 12mm difference between the two - the newer ones Tube are shorter!
Also note if you are supplying your own bolts (these don't come with the Losmandy dovetails - and I moved my wider orange rail to the top of the OTA and placed the Losmandy D saddle at the bottom - took several trips to speciality nut and bolt wareshouses until I found a match!):
1. Make sure the bolts selected are stainless steel - and that they are not so long that they will protrude into the OAT and hit the mirror at the rear when it racks in and out - else major destruction - cut them appropriately to size and file the end smooth (and if you wish after cutting and filing paint the end of the bolts black to stop light scatter!
2. From memory the front bolt is a very special one - only one nut speciality store in Sydney (near Paramater stocked them) - they are stainless steel and a common width - but a very unsual pitch and thirdly a very special thread size - apparently mainly reserved for American gun sight mountings (8 / 32), but the thread width was distinctly unusual. If you get totally stuck message me - I may have a spare - but I will have to search my astro lab for them. The rear nuts are different again - but a bit easier to source!
Finally - if you have to cut stainless steel nuts down and haven't done that before - you place two or three nuts on them and use this to hold them tightly in a vise - then cut them to size. The you take it out of the vice and slowly take the nuts on and off a few times - so smooth out the cut thread - then your gentyly file them down so there is no sharp edges left and wipe any residual steel dust off the ends!
