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Grease seal TR4 late only. RevingtonTR prefer to use the uprated part SPF2496K in preference to the standard part. Both are available. The choice is yours!

See below for an explanation of the two types of lock washers and seals used during TR2 to TR4 production.
As  two types of lock washer and seals were used by Triumph there is room for confusion and the possibility of using parts that are not compatible.
The width of sealing ring 115702 is 5/16" and they are used on the trunnion/wishbone joint of all TR2-TR4 up to a point in TR4 production at CT7219 when a different seal 134319 was used along with 16 shims 134239 and 4 stepped lock washers to accommodate the shims. Whist we will never know for sure why the change was made, our assumption is that Triumph had complaints about the rubber seals falling off, especially the outer ones where there is nothing to hold the seal mechanically in place.
Revington TR have now produced seal 115702 in polyurethane, which is immune to the effects of the atmosphere, grease, oil etc. The alternative SuperPro Polyurethane part is available in packs of four. See part number SPF2496K below.

Seal 115702 is also used on the lower inner wishbone bushes from TR3 to TR4 inclusive. TR2 having rubber bushes at the lower inner do not need these seals.  
When replacing the lock washers and seals, RevingtonTR recommend using the early lock washer 115701 with SuperPro seals SPF2496K (set of 4 seals, the equivalent of 115702). These SuperPro polyurethane seals will not swell or crack in the presence of oil and grease and as they have been designed as a tight fit, our experience of over 20 years using them, is that they will not  fail or fall off. 
We supply all the parts needed to bush the outer wishbones to trunnion pin under part number 101557K 
As the later seal, lock washers and shims were used in one location only, for a portion of TR4 production with a small number of cars remaining,  we do not envisage offering these seals 134319 manufactured from Polyurethane whist a perfectly satisfactory solution exists by using lock washer 115701 and seal kit SPF2496K.

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