When you say spacer, do you mean spacing out a cassette hub for singlespeed:
http://www.ebay.co.uk/itm/VeloSolo-CNC-SINGLESPEED-Cassette-Hub-SPACER-KIT-/380267449848?pt=UK_sportsleisure_cycling_bikeparts_SR&var=&hash=item5889b4cdf8
Or spacing out a modern singlespeed / fixed wheel (120mm) to your frame (126?)
http://www.ebay.co.uk/itm/CNC-Aluminium-M10-Hub-Axle-SPACER-KIT-110-120-126-130mm-/300498720521?pt=UK_sportsleisure_cycling_bikeparts_SR&var=&hash=item45f71e9709
@NickCJ started
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When you say spacer, do you mean spacing out a cassette hub for singlespeed:
http://www.ebay.co.uk/itm/VeloSolo-CNC-SINGLESPEED-Cassette-Hub-SPACER-KIT-/380267449848?pt=UK_sportsleisure_cycling_bikeparts_SR&var=&hash=item5889b4cdf8
Or spacing out a modern singlespeed / fixed wheel (120mm) to your frame (126?)
http://www.ebay.co.uk/itm/CNC-Aluminium-M10-Hub-Axle-SPACER-KIT-110-120-126-130mm-/300498720521?pt=UK_sportsleisure_cycling_bikeparts_SR&var=&hash=item45f71e9709